Two parrots have different parents. One parrot has red chest feathers, and the other parrot has yellow chest feathers. Why do the parrots have different feather
colors on their chest?

a. Each parrot has different feather colors because offspring from different parents will
have different feather colors

b. Each parrot has different feather colors because they have different versions of the
gene for feather color that connect together to make different feather colors.

c. The parrots have different versions of the gene for feather color, and the genes are
different colors in each parrot's feathers.

d. The parrots have different versions of the gene for feather color, which instruct for
different proteins that connect in different ways to make different feather colors.