Answer:
Hepatitis A virus
Explanation:
Hepatitis A can be described as a contagious liver disease. It is caused by an infectious virus known as the hepatitis A virus.
This virus causes inflammation in the liver. Symptoms for the infection can be seen in some people while for others there are no symptoms.
Symptoms include jaundice, urine of dark colour, pale skin colour, vomiting etc.
Hepatitis A can be spread through one person to another by methods like faeces of an infected person etc.
Measures for hepatitis A control are washing hands thoroughly, purchasing shellfish from an authentic place or supplier as the hepatitis A virus lives in water.
Which structure(s) is/are primarily responsible for the release of catecholamines?
Answer:
The correct answer is - adrenal medulla.
Explanation:
The adrenal medulla is the structure that has the cells called chromaffin cells and the postganglionic fibers of the Sympathetic nervous system and brain. Catecholamines are neurotransmitters that include epinephrine, dopamine, and norepinephrine. The secretion or release of the Catecholamines is from the adrenal medulla of the brain.
Thus, the correct answer is - adrenal medulla.
Small-chain fatty acids can enter the bloodstream directly, but large-chain fatty acids must be packaged first before entering the__________.
Answer: lymph
Explanation:
Lymph is a fluid that flows to the lymphatic system. When the fluid runs in the lymph capillaries is called as the lymph. The lymph is a colorless fluid that consists of white blood cells. The lymphatic system has the function of absorption of fat-soluble vitamins and fats from the digestive system. The lymphatic system transports these substances into the venous circulation.
Which of the following best describes mollusks? a) They are bilaterally symmetrical and have a soft body sometimes covered with a shell. b) They are bilaterally symmetrical and have a soft body always covered with a shell. c) They have radial body symmetry and a soft body sometimes covered with a shell.
Answer:
They are bilaterally symmetrical and have a soft body sometimes covered with a shell.
Explanation:
Mollusks are bilaterally symmetrical organisms which means only two planes can divide their bodies into two identical halves. They are triploblastic organisms with organ system level of body organization. Mollusks have a soft body that is usually covered by a dorsal shell composed mainly of calcium carbonate. The foot is a broad, flat and muscular structure located ventrally. Foot serves these organisms in locomotion. The various body organs are present as visceral mass located above the foot. The visceral mass is covered by a thin sheet of tissue called mantle. Example: clams, snails, and squids.
The following that best describes mollusks is :
b) They are bilaterally symmetrical and have a soft body sometimes covered with a shell.
"Characteristics of Mollusk"The following that best describes mollusks is that they are bilaterally symmetrical and have a soft body sometimes covered with a shell.
A mollusk is any of a wide phylum of invertebrates (such as snails, clams, or squids) with a soft, unsegmented body contained in a calcareous shell.
Malacology is the study of Mollusks.
They are slow-moving invertebrates with a thin fleshy membrane or mantle that covers the internal organs.
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Orlando, 14, frequently twists his head uncontrollably and yelops or grunts. If he has not done this for several hours, he has a sensation that can only be relieved by engaging in these movements and sounds. Orlando has had this problem since he was 8. The most likely diagnosis is
a. Tic disorder
b. Coprolalia
c. Tourette's syndrome
d. Obsessive-compulsive disorder
Answer:
The correct answer is option c, that is, Tourette's syndrome.
Explanation:
Tourette's syndrome refers to an issue with the nervous system in which the individual possesses no control over his movements like turning his or her head, creating certain sounds like grunts. These activities are known as tics, and the person suffering from the condition loses the tendency to control their movements.
An individual suffering from this condition blurt out words, and in place of saying anything blinks their eyes. Thus, in the given question, Orlando is suffering from this condition.
A person’s estimated maximal heart rate is found by subtracting his or her age from the number _____.
A. 230
B. 210
C. 200
D. 220
The estimated maximal heart rate can be found by subtracting the age from 220.
Explanation:
The correct answer is D. 220.
To estimate a person's maximal heart rate, you subtract their age from 220. For example, if a person is 25 years old, their estimated maximal heart rate would be 220 - 25 = 195.
This formula is commonly used in exercise physiology and can help determine target heart rate zones for exercise.
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A person's estimated maximal heart rate is found by subtracting his or her age from 220. For example, a 30-year-old would have an estimated maximal heart rate of 190 beats per minute.
Explanation:To estimate the maximal heart rate of a person, you subtract their age from the number 220. This formula is commonly used in health, fitness, and physiology to evaluate the effort level and exercise intensity. For example, if a person is 30 years old, their estimated maximal heart rate would be 220 - 30 = 190 beats per minute. It's important to note that this method of predicting maximal heart rate is only an approximation, and actual heart rates can vary depending on an individual's overall health and fitness.
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The leaves of a plant are dotted with openings known as stomata. When open, stomata allow the plant to exchange gases and allow moisture to evaporate, helping to draw water from the roots up into the plant. These activities help the plant to:_______a. maintain homeostasisb. synthesize mineralsc. produce light energyd. decompose organic matter
Answer:
maintain homeostasisExplanation:
Plants maintain homeostasis in two ways:
1. By keeping their stomata open to allow the diffusion of gases so that photosynthesis reaction takes place in the organisms.
2. By maintaining the water content in plants by evaporating the excess amount of water through leaf stomata. The loss of water is own of the cause of the transpirational pull in the plants.
Thus, plants maintain their homeostasis by these two mechanisms.
Bile is produced by the __________ but stored in the __________.
A) liver; pancreasB) gallbladder; liverC) liver; gallbladderD) small intestine; pancreasE) gallbladder; pancreas
Answer: option C) liver; gallbladder
Explanation:
Bile is derived from the degradation of Cholesterol, a vital component of cell membranes. This Cholesterol is produced in the Liver; so bile as well is produced in the Liver.
Once produced, bile is transported through the bile duct to the Gall bladder, where it is stored until when needed for fat digestion.
Therefore, Bile is produced by the LIVER but stored in the GALL BLADDER.
Answer:
D
Explanation:
Sheryl was diagnosed with bipolarity when she was a teenager.She's hesitant to tell her friends, and tries her best to hide herdiagnosis from her coaches, teachers, and employers, since she'sseen other people with the illness be discriminated against onaccount of it. Bipolarity is an example of a(n):Select one:
a. Untreatable illness
b. Stigmatized illness
c. Withdrawn illness
d. Contested illness
Answer:b. Stigmatized illness
Explanation:
Due to extreme elevated moods( manic expression); it is difficult for an individual with bipolar disorders to relate and associate with people in immediate environment. This is because once people are aware of this conditions, discrimination sets in, the assumption is that anger and manic display can set in even when engaged even in trivial issues, by eliciting spike potentials in the brain
However, this act, put the victim in state of anxiety, depression,suicidal thoughts, withdrawal, and loss of energy.
Answer:
The correct option is b. Stigmatized illness.
Explanation:
Bipolarity is a mental illness that produces unusual mood swings in a person, including serious episodes of mania and depression. It is considered a stigmatized disease, due to the prejudices generated by psychiatric disorders/mental illness, since in society in general there is confusion regarding bipolar disorder. Stigmatize, refers to when a person or group is negatively indicated, influenced or discriminated by prejudices and stereotypes. Part of the population that was diagnosed with bipolarity, often do not make it public, for fear of rejection by others.
How does smooth muscle appear different at the cellular level than skeletal and cardiac muscle
Answer:
Smooth muscle:
At cellular level these muscles are cylindrical in appearance. There cells are unbranched. These are non striated.
Skeletal muscles:
These Muscles at cellular level appears as cylindrical and also they are unbranched. These are striated at cellular level.
Cardiac muscle:
These muscles are like skeletal muscles and smooth muscles in the sense of their cylindrical nature but these muscles are branched in contrast to others. These are striated.
Explanation:
Other differences are attached with this answer please find attachment.
How do eukaryotic plants obtain energy at night to maintain sufficiently high levels of ATP?
Answer: The plants get energy by the help of the process known as photosynthesis.
At night the plants rely on the process of glycolysis and mitochondrial respiration to generate the ATP for the cellular processes.
The process of glycolysis can be defined as the the breakdown of carbohydrates into pyruvate and the release of ATP for the cellular process.
The mitochondrial reactions can be defined as the set of metabolic reactions to convert energy stored in the macronutrients to ATP.
This is how the eukaryotic plants get sufficient amount of energy at night.
When looking at growth in a human embryo, the head develops before the rest of the body. Such growth from the head to the base of the spine illustrates the ________ principle.
Answer:
Cephalocaudal.
Explanation:
Cephalocaudal refers to the head to the toe of the body. The cephalocaudal principle denotes the motor and the physical development of the individual infants to the early childhood.
This principle explains the phenomena of the post natal development and includes the development of the weight, size, and differentiation of the body. The development always occur from the top to the bottom fashion. The first control of the head will occur and later the toe.
Thus, the answer is cephalocaudal.
The growth pattern in a human embryo, where the head develops before the rest of the body, is an example of cephalocaudal principle.
Explanation:The growth pattern in a human embryo, where the head develops before the rest of the body, is an example of cephalocaudal principle.
This principle states that development occurs from the head (cephalic) to the tail (caudal) or from top to bottom. It means that structures closer to the head, such as the brain, develop earlier than structures further down the body, like the spine.
This growth pattern is evident during embryonic development and helps establish the basic arrangement of tissues in the nervous system.
The central dogma of molecular biology is that dna is transcribed into mrna, which is then to protein?
Answer:
which is then translated to proteins
Explanation:
The central dogma was given by Francis crick which says that the genetic information passes from DNA to mRNA and mRNA to protein but reverse passage of information is not possible.
The process of conversion of DNA into mRNA is called transcription and the process of formation of proteins from mRNA is called translation. The genetic information is present in the sequence of nucleotides that are present in the DNA.
These nucleotides form the triplet codon in the mRNA and each triplet codon codes for a particular amino acid during translation.
Final answer:
The Central Dogma of molecular biology describes the process by which DNA is transcribed into RNA, specifically mRNA, which is then translated into proteins that carry out cellular functions.
Explanation:
The Central Dogma of molecular biology is a fundamental concept that delineates the flow of genetic information within a biological system. The process starts with DNA transcription, during which the DNA sequence is copied into messenger RNA (mRNA) by RNA polymerases. This mRNA then serves as a template for protein synthesis or translation. During translation, ribosomes read the genetic code inscribed on the mRNA strand in groups of three nucleotides known as codons. Each codon specifies a particular amino acid, which are the building blocks of proteins. Hence, the sequence of amino acids in a protein is determined by the sequence of nucleotides in the mRNA, which in turn is determined by the sequence of nucleotides in the DNA.
Jumping Jack Flash is a champion racehorse. A special diet and daily exercise have made him the fastest horse in the country. In the wild, Jumping Jack Flash would survive longer than other horses because of his speed. Is this an example of natural selection?
a. Yes, because he is very well adapted to his environment.
b. Yes, because his speed is the result of a random event.
c. No, because his speed is a result of diet and exercise, not a genetic trait.
d. No, because slower horses are better adapted to the environment.
Answer:
c. No, because his speed is a result of diet and exercise, not a genetic trait.
Explanation:
Natural selection is the differential survival and reproductive success of some individuals of a population. This is attributed to the presence of beneficial genetic variations in them. Natural selection always targets the adaptive genetic traits. In the given example, a specific diet and exercise led to increased fitness and survival chances of Jumping Jack Flash. Diets and exercises are not genetic traits on which natural selection can be operative. Therefore, it is not an example of natural selection.
Answer:
no because his speed has been gained by his diet and his exercise.
Explanation:
Which is NOT a vector that carries and transmits pathogens to humans and other animals?
Answer:
Some virus or bacteria that is transmited without a carriage, as a sexual transmited disease
Explanation:
Usually vectors are animals, and mainly arthropods (mosquitoes, ticks, beetles, fleas, etc).
There are 5 ways to transmit a disease
Oral: by eating it, vector: some arthropods carry the disease and passed it out, fomites: something like a knife has a pathogen and when you cut yourself you get infected, aerosol: is in the air, zoonotic: as an example if a rat bites you and you get infected with rabia, direct contact: as an example when someone pass HIV to other person through sexual contact
A scientist was studying the effects of oil contamination on ocean seaweed. He believed that oil runoff from storm drains would keep seaweed from growing normally. He had two large aquarium tanks of equal size. He kept the amount of dissolved oxygen and the water temperature the same in each tank. He added some motor oil to one tank but not to the other. He then measured the growth of seaweed plants in each tank. In the tank with no oil, the average growth was 2.57cm/day. The average growth of the seaweed in the tank with oil was 2.37cm/day. Based on this experiment, answer the following questions:
What was the question that the scientist started with?
What was his hypothesis?
Identify the independent variable.
Identify the dependent variable.
Identify the control(s).
What did the data show
Answer:
What was the question that the scientist started with?
What affect does oil contamination have on ocean seaweed?
What was his hypothesis?
His hypothesis is that oil run off would keep seaweed from growing normally.
Identify the independent variable.
The oil.
Identify the dependent variable.
The ocean seaweed.
Identify the control(s).
The water.
What did the data show
The data showed that oil contamination in water does in fact have an affect on ocean seaweed. The plant in water without water grew .20 more centimeters than the plant in the oil contaminated water.
Brainliest please?Question:
Does ocean contamination with oil can negatively effects the growth of ocean seaweed?
Hypothesis:
According to his believe the hypothesis should be: Oil runoff is effective in increasing the growth of seaweed.
Independent variable:
Independent variable is the variable which can be changed in an experiment. Here, the independent variable is the oil whose effect is to be observed on the growth of seaweed.
Dependent variable:
The dependent variable is the outcome of the experiment it changes with the effect of the independent variable. Here, the dependent variable is growth of the seaweed with the effect of oil.
Control(s):
Control is a specimen in the experiment which is kept as a benchmark for comparison and no experiment is done on it.
Here, the tank in which only water was used to observe the growth of seaweed is the control.
Data:
The data shows that the oil is not responsible for enhancing the growth of seaweed instead the tank with only water content was helpful for raising the plants with greater growth as on the other one having water and motor oil both.
Hence, it can be stated that the scientist hypothesis is false and the oil runoff can inhibit the growth of the seaweed rather than increasing its growth.
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Life insurance could alleviate estate problems caused by
Answer:
lack of liquidity
Explanation:
Estate is nothing but an individual's total sum of financial assets and liabilities at the time of his death.
Now the estate problems caused by lack of liquidity can be alleviated with the help of life insurance. Insurance will provide the required liquidity for the time. As selling of estate to get proper price might take sum time.
Reflex activity can be modified by the cerebral cortex. For example, you are baking a roast in the oven. As you are moving the roast from the oven to the counter, hot juices splash you. Reflex activity would cause you to drop the pan, but you hold on to it. Explain how the cerebral cortex overrides the reflex.
Answer:
There are different types of reflexes, and some of them can be controlled voluntarily due to cortical processing.
Explanation:
Even if there is an initial myotactic reflex of moving away from the heat, the cortical processing that is subject to learning makes you not let go of the pan. It should be noted that there are different types of reflexes, and not all postural reactions are automatic. The cerebral cortex influences voluntary postural adjustment movements. Such control is mainly performed by the brain stem, where ocurrs the modulation of motor neurons and spinal cord interneurons through the lateral descending (fine movements) and medial (posture and balance) downward pathways.
The cerebral cortex can override a reflex by processing sensory information and integrating it with emotions, memories, and other stimuli to send a motor command that directs voluntary actions, like holding onto a hot pan despite discomfort.
Explanation:When a person comes into contact with a hot object, the immediate, reflexive response is to withdraw from the heat source. This type of reflex action typically involves a sensory neuron detecting a stimulus and sending a signal through the spinal cord, bypassing the brain for a quick reaction. This is why reflexes are so fast because they involve local synaptic connections in a form of a reflex arc.
However, the cerebral cortex can modify this reflex activity. It processes the sensory information and can integrate it with other stimuli, emotional states, and memories. Upon receiving the sensory information of the hot splash from the roast, your cerebral cortex quickly processes the pain but also recognizes the importance of not dropping the pan. It then sends a motor command to override the reflex to hold onto the pan despite the discomfort.
In this case, the cerebral cortex functions efficiently to form a decision based on complex factors such as the consequence of dropping the pan and the potential waste of effort and food. Therefore, when you override a reflex, it is the result of the cerebral cortex engaging in higher-level thinking and decision-making processes, allowing for voluntary control over what would otherwise be an automatic reflexive action.
When removing a needle from a reusable syringe, which of the following is acceptable to use:
Answer:
Hub clamping device.
Explanation:
The syringe cannot be used if it is contaminated with some pathogens. The reusable syringes are used in the hospitals. The needle must be removed from the syringes to use it again.
The different devices are used for the reusable syringe. The hub clamping device is used generally for this procedure. The device must have the increased level of the dynamic stress, high density power and must involve the tight budgets.
Thus, the answer is hub clamping device.
Molecular systematics might examine all of the following types of data EXCEPT ________.
A) proteins
B) DNA sequences
C) amino acid sequences
D) anatomical features
Answer:
Anatomical features.
Explanation:
Molecular systematics may be defined as the use of the molecules to understand and deduce the evolutionary relationship. The classification of the organism is more easy by using the molecular systematics.
The plant evolutionary relationship can be made on the basis of the molecular systematics. The molecules that are used in the molecular systematics are proteins, amino acid, RNA and DNA sequence. The anatomical features might involve in the morphology systematics.
Thus, the correct answer is option (D).
Molecular systematics does not examine anatomical features. It works with data like DNA sequences, amino acid sequences, and proteins, which are used to understand the genetic relationships between different species. option D is the correct answer .
Explanation:Molecular systematics is a science that uses techniques and information from molecular biology to understand the genetic relationships between different species. It mainly works with data like DNA sequences, amino acid sequences and proteins to gather information about the hereditary patterns and evolution. However, it does not deal with anatomical features as these are part of the field of classical systematics or morphological systematics, which is more concerned with physical characteristics and structures.
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In a given population, a few individuals may, by random chance, leave behind more descendants than other individuals. Thus, the genes of the following generation will have a higher proportion of the alleles of the "lucky" individuals. Which of the following concepts is this example representative of?
a. the bottleneck effect
b. mutation
c. migration
d. the founder effect
e. genetic drift
Answer:
Genetic drift
Explanation:
Genetic drifting is a phenomenon which results in a variation of allele frequency in a population. It results in the loss of certain allele due to low reproduction and increase in certain allele due to increased reproduction rate
While on an intersession course in tropical ecology, Kris pulls a large, snakelike organism from a burrow (the class was granted a collecting permit). The 1-meter-long organism has smooth skin, which appears to be segmented. It has two tiny eyes that are hard to see because they seem to be covered by skin. Kris brings it back to the lab at the field station, where it is a source of puzzlement to the class. Kris says that it is a giant oligochaete worm; Shaun suggests it is a legless amphibian; Kelly proposes it belongs to a snake species that is purely fossorial (lives in a burrow).Which characteristic should permit the class to conclude that it is probably not a snake?
A) the number of eyes
B) its presence in a burrow
C) the absence of scales on its surface
D) the size and condition of its eyes
E) its length
Answer:
C) the absence of scales on its surface
Explanation:
Snakes bodies are covered with scales. The scales are waterproof and helps for griping on rough branches and movement
This is a cell, which is the basic unit of all life. All organs in human bodies are made of cells and require oxygen to survive. Which two systems work together to deliver oxygen to cells throughout the body?
Final answer:
The cardiovascular system and the respiratory system work together to deliver oxygen to the body's cells and remove carbon dioxide. The cardiovascular system circulates blood, while the respiratory system manages gas exchange in the lungs.
Explanation:
The two systems that work together to deliver oxygen to cells throughout the body are the cardiovascular system and the respiratory system. The cardiovascular system, composed of the heart, blood vessels, and blood, is responsible for moving oxygen-rich blood from the lungs to the cells and transporting carbon dioxide from the cells back to the lungs. The respiratory system, which includes the lungs, enables the exchange of gases; oxygen is absorbed into the blood, and carbon dioxide is expelled from the body.
These systems are integral to the process of respiration, wherein oxygen is required for aerobic cellular respiration, which generates the energy necessary for cellular functions in the form of ATP. Without this collaborative effort between the cardiovascular and respiratory systems to continuously supply oxygen and remove carbon dioxide, cells could not sustain their vital activities.
Therefore, to answer the question, the cardiovascular and respiratory systems are the two organ systems that work in tandem to ensure that oxygen is delivered to every cell in the human body, maintaining cellular function and overall organism health.
A DNA molecule consists of two antiparallel strands of polynucleotides. Each strand is composed of nucleotides bound to each other along the sugar-phosphate backbone.
Answer:
Explanation: The basic unit of a DNA is a Nucleotide. The nucleotide comprises of: the nitrogenous bases, a deoxyribose sugar and a phosphate group. The nitrogenous bases are the purines and pyrimidines . The include, Adenine, guanine, Thymine and cytosine
Answer:
True.
Explanation:
The DNa molecule is made up of two antiparallel strands and complementary to each other. That's because each strand is polynucleotide, which means it is made up of several nucleotides.
Each nucleotide is formed by a nitrogenous base, a phosphate group and a sugar. The heterogenated bases of DNA are: adenine, guanine, thymine and cytosine, and they are responsible for linking the two strands of DNA, since the adenine of one strand is able to make connections with the thymine of the other strand and guanine from one strand is capable of making connections with the cytosine of another strand.
A diploid human cell normally has 23 pairs of homologous chromosomes, but as a woman ages, the chances of nondisjunction increase. Imagine that a gamete is produced in which the two homologues of chromosome 21 have failed to separate. If the gamete is fertilized with a normal sperm, the embryo’s cells will contain _______ chromosomes.a. 23
b. 24
c. 46
d. 45
e. 47
Answer:
e. 47
Explanation:
The situation is called Regular Trisomy 21. Its associated with with Down's syndrome. This is due to uneven division of the chromosomes (non-disjunction) at either the first or the second meiotic division, in either parent.
In this case, the individual has an extra chromosome 21 in every cell resulting in 47 chromosomes instead of the usual 46.
This condition results from unusual cell division which yielded either an egg or a sperm with 24 chromosomes instead of regular 23. When this egg or sperm fuses with regular egg or sperm, the first cell of the developing baby will be 47 chromosomes instead of 46 resulting in a baby with 47 chromosomes.
The __________ is involved in encoding and transferring new explicit memories to long-term memory.A. cerebellum
B. amygdala
C. hippocampus
D. prefrontal cortex
Answer:C. hippocampus
Explanation:the hippocampus is located within the medial temporal lobe of the brain.it is involved Involved in forming long term memories.
It is also involved in spatial navigation,that involves navigating around familiar paths.
It is involved in forming memories that can be reflected on and discussed about.
A damage to the hippocampus can cause inability to form long term memories.
Select the three factors from the choices below that determine the size of the actual focal spot on the target anode.
Answer: A focal spot in the x-ray setup is the area of the anode surface which receives the beam of electrons from the cathode. It is the apparent source of x-rays.
Below are some of the factors that affect its size.
Explanation:
Size of the focal spot depends on
* angle of the anode
Other prime factors that affect x-ray emission; under the control of the radiographer includes;
• Miliamperage-second (mAs)(tube current measurement)
• Kilovoltage (kVp) Controls both the quantity and quality of the x-ray beam with the speed and energy.
• Distance (d) - Related to tube design and construction.
• Tube housing
• Target material
• Filtration
• Voltage waveform
Which of the following muscles is probably underactive if a client's support or standing leg falls inward during a single-leg squat assessment?A. adductor complexB. gluteus mediusC. tensor fascia latae (TFL)D. vastus lateralis
Answer:
Answer is A.
Explanation:
Abductor complex include the abductor muscles which are three in number, Longus, Magnus and Brevis.
The abductor muscle of the leg spread the legaway from the midline.
Which cellular component would be responsible for the classic shape of a red blood cell?
The question is incomplete as it does not have the options which are-
nucleus cytoskeleton lysosome mitochondriaAnswer:
The correct answer will be- cytoskeleton
Explanation:
The shape of the red blood cell is "biconcave" which could be due to the elasticity or bending property of the cell membrane.
Also, the shape of the red blood cells is maintained by the "cytoskeletal structures" like microtubules, intermediate filaments and the actin filaments. These structures help determine and maintain the shape of the cell.
Thus, the cytoskeleton is the correct answer.
If crossing over and independent assortment ceased to occur,
a. genetic variation would decline rapidly, with sperm or ova having the same alleles.
b. sperm will always have the same alleles, but ova will always have different alleles.
c. ova will always have the same alleles, but sperm will always have different alleles.
d. sperm or ova would alternate between the types of alleles they will contain.
Answer:
Genetic variation would decline rapidly, with sperm or ova having the same alleles.
Explanation:
Crossing over is the exchange of genetic material between the chromatids of homologous chromosomes. It results in the formation of recombinant chromatids that have new combinations of maternal and paternal alleles. The gametes with recombinant alleles impart genetic variations to the progeny.
Likewise, an independent assortment of homologous chromosomes to the opposite poles during anaphase I of meiosis I result in the packing of alleles of a gene independent of that of the other gene. Independent assortment produces some gametes with new gene combinations and the other with parental gene combinations.
If crossing over and independent assortment cease to occur, male and female gametes will have the same alleles due to the absence of any source of recombination and the genetic variation in the progeny would be reduced.
Species A and B are lizards that eat insects. The figures at right show the preferred prey size of each species for populations living on Islands 1, 2, and 3. Determine if each of the statements below is true of these species on these islands.
A. In allopatry, species A and B eat mostly the same prey
B. In sympatry, resource partitioning has occurred
C. In sympatry, species A and B diverge in prey choice
D. Competition between species A and B affects prey choice on different islands
E. Character displacement has decreased competition between species A and species B in allopatry
Answer:
except option D all other options are true
Explanation:
Two species are said to be living in sympatric association when they live in the same area and very rarely cross with each other. However, allopatric species live in two distinct geographic areas and hence do not interact with each other. In both sympatric and allopatric case, the species do not affect the habitat, food or any other biological habit as there in no competition between the two species.
Thus, except option D all other options are true.