The following coat colors are known to be determined by alleles at one locus in horses:
palomino = golden coat with lighter mane and tail
cremello = almost white
chestnut = brown
The following table gives ratios obtained in matings of the above varieties:
Cross Parents Offspring
1 cremello x cremello all cremello
2 chestnut x chestnut all chestnut
3 cremello x chestnut all palomino
4 palomino x palomino 1/4 = chestnut
1/2 = palomino
1/4 cremello
Assign gene symbols for the genetic control of coat color on the basis of these data.
A) C1C1 = cremello, C2C2 = chestnut, C1C2 = palomino
B) C1C1 = chestnut, C2C2 = palomino, C1C2 = cremello
C) C1C1 = palomino, C2C2 = chestnut, C1C2 = cremello
D) C1C1 = palomino, C2C2 = cremello, C1C2 = chestnut
E) C1C1 = chestnut, C2C2 = cremello, C1C2 = palomino
Answer: A
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