Question

A man is heterozygous for blood group A and marries a woman who has blood group O. Use a genetic cross to show the phenotypic ratio of their offsprings

Answer 1

The child could be A+ , B+, AB+ or even O+

It depends on the father and mother whether they are heterozygous A /B+or homozygous A/B+ respectively.

If both are heterozygous I.e father is Ai and mother is Bi , then there is 25% chance of the child being A+, B+, AB+, O+ each

If parents are homozygous i.e father is AA and mother is BB, then the child will be AB+ only

If father is Ai and mother is BB, then there is a 50% chance of the child being AB+ and B+ each

If father is AA and mother is Bi, then there is a 50% chance of the child being AB+ and A+ each