ANS 3216 Lecture Notes - Lecture 40: Dilution Gene, Epistasis, Pigment
21 Jan 2016
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Document Summary
Coat color classifications are based on the effects of alleles on 7 genes at 5 loci (specific locations on the gene) Very complicated, and subtle variations are prevalent. Expression of recessive genes require a homozygous condition: both parents have to be carriers of the homozygous trait. Expression of the dominant gene indicates that at least one parent carried the dominant gene. Cccr = red color is diluted to yellow, black is unaffected. Ccrccr = both the red and black pigments are diluted. Cc = true albino: lethal in utero. W = white, epistatic: masks all other colors. Ww = white with pigmented skin and eyes. Ww = the horse is fully pigmented: not white. White horses have pink skin, white hooves, white manes and tails, and colored eyes: eyes are blue, hazel, or brown. B = production of black pigment: bb or bb = coat colors with black points, bb = lack of black pigment, produces coats with nonblack points.
