HOBET Review Questions

Category - Health Occupations Basic Entrance Test Practice Questions

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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