This pedigree chart tracks the inheritance of a recessive trait that is not sex-linked. Based on the information in the chart, which of the following statements is true?
A. Individual #8 must be heterozygous for the trait.
B. Individual #10 must be heterozygous for the trait.
C. Individual #13 must be homozygous dominant.
D. Individual #3 must be homozygous dominant.
Answers
Answer:
A. Individual #8 must be heterozygous for the trait.
Explanation:
Since the given trait is autosomal recessive, two normal but carrier (heterozygous dominant) parents can have the affected progeny. Individual 8 and individual 9 have affected son and daughter. Hence, both of them should be heterozygous dominant and carry one recessive allele to transmit to the affected progeny.
Individual 10 is affected with autosomal recessive trait and hence is homozygous recessive. Since individual 13 has two heterozygous recessive parents, it may or may not be homozygous for the dominant trait. Individual 3 have affected progeny and hence should be heterozygous dominant for the trait.
The inheritance of a recessive trait in a pedigree chart can reveal whether individuals are homoygouzs or heterozygous for the trait. An individual that does not express the trait but has offspring that do must be heterozygous. They carry one recessive allele, which is passed on to their offspring.
Explanation:Without the specific pedigree chart, it is hard to definitively answer this question. However, some general principles can be applied in relation to your question. In a pedigree that tracks the inheritance of a recessive trait, individuals that express the trait are homozygous for the recessive trait. Individuals that do not express the trait could be either homozygous dominant or heterozygous, possessing one dominant and one recessive allele.
Individuals that do not express the trait, but whose offspring do, must be heterozygous for the trait. This is because they must carry one recessive allele in order to pass it to their offspring who express the trait. For instance, if their genotype was homozygous dominant, they could not pass on the recessive trait. Only a genotype of heterozygous, consisting a dominant and a recessive allele, could pass on a recessive trait.
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