Skin color in humans is determined by a polygenic inheritance system, possibly involving as many
as 9 genes. For simplicity let's consider the influence of 3 genes: A, B, and C, where the dominant
allele darkens skin color. In this example, a person with very light skin would have the genotype
aabbcc and a person with very dark skin would have the genotype AABBCC.

Suppose a woman who is AABbCc mates with a man who is AaBbcc.

A. List all of the possible genotypes of the gametes that could be produced by each the parents?

B. Draw a Punnett square that shows the genotypes possible, and number each genotype from
lightest (1) to darkest skin coloration.

C. In this cross, how many dominant alleles will children with the darkest skin coloration possess,
and what theoretical fraction of the children will have this coloration?