If the father's blood type is AB and the mother's blood type is homozygous B, what is the percent likelihood that their offspring will exhibit type B?

Question

Quizplus · Accepted Answer

50%. There is a two out of four chance that the child will have B blood type.
Key takeaway: Using the Punnett square, it is immediately evident that the child will only have B or AB blood type. The father can donate either an A allele or a B allele, whereas the mother can only donate a B allele. It is shown below that the child is 50% likely to have a B blood type.
A | B
B AB | BB
-------- | -------
B AB | BB

If the Father's Blood Type Is AB and the Mother's