15. In humans, the allele for A type blood and the allele for B type blood show
codominance. A person with both alleles has blood type AB. Both A and B
dominate type O.
A person with an allele for type A blood and type O blood marries someone with an
allele for type B blood and type O blood. List the types of offspring they could have
and the probability for each blood type in the offspring.
(A allele = IA, B allele = IB

, O allele = i)
16. For this problem use the information given in problem 15. A young lady with type O
blood gave birth to a baby with type O blood. In a court case she claims that a certain
young man is the father of her child. The man has type A blood. Could he be the
father? Can it be proven on this evidence alone that he is the father?
17. In horses, black color (B) dominates chestnut color (b). The trotting gait (T)
dominates the pacing gait (t). A cross is made between a horse homozygous for black
color and the pacing gait and a horse homozygous for chestnut color and
the trotting gait. List the probable genotype and phenotype of offspring resulting from
such a cross.