Problem 7

Color pattern in a species of duck is determined by one gene with three alleles. Alleles H and I are codominant, and allele i is recessive to both. Note: this situation is similar to the ABO blood system.

How many phenotypes are possible in a flock of ducks that contains all the possible combinations of these three alleles?


As in the ABO blood system 4 phenotypes are possible in this case:

HH, Hi
II, Ii