What is the simplest explanation for the inheritance of these colors in chickens?
Incomplete or codominance. Feather color is controlled by 2 genes B = black and b = white. The third phenotype is the result of a 50-50 mix of black and white to produce gray.
The 15 gray, 6 black, and 8 white birds represent a 2:1:1 ratio&emdash;the result of mating two heterozygous individuals: (Bb x Bb)
What offspring would you predict from the mating of a gray rooster and a black hen?
A gray rooster (Bb ) mated to a black hen (BB ) can be represented by the following Punnett square:
50% of the offspring should be gray (Bb ) and 50% black (BB )