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)
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.
The Biology Project
Department of Biochemistry and Molecular
University of Arizona
Thursday, October 1, 1998
Revised: November 2004
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