Question

A woman with blood type a (whose parents both had AB blood) mates with a man with blood type B (his mother was AB and the father was O blood). Show the cross and the genotype and phenotype ratios of the potential offspring.

Answer 1

Answer:

1 AB:1 A

Explanation:

     Ia       Ia

Ib  IaIb     IaIb

i    Iai       Iai

i represents type O blood which is always recessive

the capital I represents co-dominant traits (a or b)

Iai is type A because O is recessive and will be masked by Ia

IaIb is type AB because both capital I traits will be codominant

This cross ultimately gives a 1:1 ratio of type A to type AB