Question

A person with type A blood has a child with a person who has type AB blood. Is it possible that the child can have type B blood? Explain using a Punnett square.

Answer 1

Yes , it’s possible if person with type A blood has a genotype I^Aj⁰

I^Aj⁰ and I^AI^B

So if we draw Punnett square we get such offspring

F 1: I^AI^A , I^AI^B , I^Aj⁰ , I^Bj⁰

So we have probability 25% to get child with type blood B( I^Bj⁰ )

But of person with type A blood has genotype I^AI^A , their child can not have type B blood , because of:

I^AI^A and I^AI^B

Offspring has genotypes I^AI^A or I^AI^B