Question

A couple each with blood type AB and normal pigmentation have a child with AB blood type and albinism. What is the probability that their next child will have the same phenotype as the first child?

Answer 1

Given, A couple each with blood type AB and normal pigmentation have a child with AB blood type and albinism.

Let, allele A represent normal skin pigment which is dominant over allele a (responsible for albinism).

Genotype of father:

Gametes:

Genotype of mother:

Gametes:

Genotype of daughter:

Cross:

Probability of having a next child with phenotype = 2/16 = 1/8.