Question

woman gives birth to a son who has type AB blood. She has type B blood. Which of the following can be concluded from this about her parents' blood types?

One of her parents had at least one B allele.

One of her parents had type AB blood.

One of her parents had type B blood and the other type A blood.

One of her parents had at least one A allele and the other at least one B allele.

Answer 1

One of her parents had at least one A allele and the other at least one B allele.

Answer 2

One of her parents had at least one A allele and the other at least one B allele.