Practice Quiz

IB Biology Exam Prep

Category - Biology

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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. 10%
  3. 25%
  4. 50%
  5. 75%
Explanation
Answer: D, 50%. There is a three 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 obvious that the child is 50% likely to have a B blood type.
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