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Please help me to solve this pedigree ...........................

Please help me to solve this pedigree ...........................

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Grade:12

1 Answers

Simran Vinaik
askIITians Faculty 1230 Points
6 years ago
Since this is autosomal recessive trait inheritance pedigree so B will have “aa” genotype that is why B is able to express the phenotype in homozygous recessive condition.

Parent A can have AA or Aa genotype.

We can easily find that Parent A has genotype as AA because none of his/her progeny are showing the trait/disease.

if the parent A was Aa then he/ she should have 50% probabilty of affected progeny but that is not the case.

So option 1) is correct

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