Fast-twitch muscle fibers, such as those that predominate in the legs of sprinters, than slow-twitch fibers, which predominate in the legs of marathon runners.

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )

this is a good question! i'll do some research and come back when i have the answer!