Monohybrid Cross Problem Set

Problem 13: Predicting human blood types

What are the possible blood types of the offspring of a cross between individuals that are type AB and type O? (Hint: blood type O is recessive)

Tutorial

In this problem (in contrast to problem 11), there is no uncertainty about the genotype of either parent. A parent of blood type AB has the codominant IA and IB alleles. A parent of blood type O is homozygous recessive for the i allele.
The Punnett square for their offspring is shown to the right. The genotypes of their offspring could be either IAi or IBi. Their children could be in blood groups A or B, but not AB or O.

For more information on Blood Types inheritance go to our Blood Types Tutorial within the Human Biology Section of The Biology Project.

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University of Arizona
Thursday, October 1, 1998
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