The pedigree in the accompanying illustration shows the inheritance of albinism, a homozygous recessive condition resulting in a
total lack of pigment. Specify the following genotypes using A and a to indicate dominant and recessive alleles, respectively. The solid figures represent albino individuals. What is the likely genotype of individual B-3?
1 answer:
The question lacks the pedigree information. The pedigree has been attached below.
Answer:
AA/Aa.
Explanation:
The albino is a autosomal recessive trait means this trait will only be visible when the individual is homozygous recessive for the trait. The heterozygous individual acts as a carrier.
In the given, pedigree the parents are unaffected but one of their child is affected means that the parents are heterozygous for the trait. The croos between the parent Aa × Aa results in the progeny with genotype AA, Aa, Aa ( normal ) and aa (affected). The individual B-3 is unaffected and can have either genotype AA or Aa.
Thus, the answer is AA or Aa.
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