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?
  1. 0%
  2. 25%
  3. 50%
  4. 75%
  5. 100%
Explanation
Answer: C, 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
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