Chapter 4, Problem 24PDQ

Horses can be cremello (a light cream color), chestnut (a reddish brown color), or palomino (a golden color with white in the horse's tail and mane).

Of these phenotypes, only palominos never breed true. The following results have been observed:

cremello $\times$ palomino	→	1/2 cremello 1/2 palomino
chestnut $\times$ palomino	→	1/2 chestnut 1/2 palomino
palomino $\times$ palomino	→	1/4 chestnut 1/ 2 palomino 1/4 cremello

(a) From these results, determine the mode of inheritance by assigning gene symbols and indicating which genotypes yield which phenotypes.

(b) Predict the F₁ and F₂ results of many initial matings between cremello and chestnut horses.