Blood type in humans follows a multiple allele inheritance pattern. There are three
alleles for blood type in the human population, and each person only carries two of
those three alleles within their genome. One allele is inherited from the father, and the
other allele is inherited from the mother. The A-type allele, IA, is codominant with the
B-type allele, IB, which are both completely dominant to the recessive O-type allele, i.
These alleles combine to create one of four phenotypes, type A blood (either genotype
IAi or IAIA), type B blood (either genotype IBi or IBIB), type AB blood (genotype
IAIB), and type O blood (genotype ii).
A mother with type A blood has a son with type O blood. Identify the genotype that the
father must have in order to produce this child.
Answers:
I^A I^B
I^B I^B
I^A I^A
I^B i
