Question

A man, whose father had normal fingers, has inherited syndactyly, an autosomal dominant trait. He is married to a normal woman. What is the probability of producing an offspring that has webbed fingers or toes

Answer 1

Answer:

The correct answer is - 50 % or 1/2 chances.

Explanation:

As it is given that the father of the man with syndactyly had normal father which is only possible if he had two recessive alleles as it is an autosomal dominant condition, therefore, it also means the mother of man must have one or two dominant alleles for the disease and one is passes to the man, so the man is heterozygous for the diseases gene.

Man - Ss married to a normal woman which means she has both recessive alleles that is ss.

       S     s

s      Ss   ss

s      Ss    ss

The probability of the webbed fingers or toes from this punnett is 1/2 or 50%