Consider 3 loci in horses:

White locus	W- is white	WW is lethal	ww allows other colors
Black/Chestnut locus	E- is black	ee is chestnut
Dilution locus	D- dilutes black to grulla and chestnut to red dun.		dd allows full color expression

Full expression of black and chestnut occurs in the presence of the dd genotype at the D locus and ww at the W locus. The white is expressed when the animal is Ww regardless of alleles present at the other two loci.

From the mating of trihybrids what is the phenotypic ratio of the progeny at birth?

	white	grulla	black	red dun	chestnut
WwEeDd x WwEeDd

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