Awhite rooster mates with a black hen. the offspring is gray in color. what is this phenomenon called?

Incomplete Dominance.  Hope this helps

@LightningEmerald1

How do I show work for this?

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.