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Genetics Experience Required In rabbits, an allelic series helps to determine coat color: C (full color),...

Genetics Experience Required

In rabbits, an allelic series helps to determine coat color: C (full color), cch (chinchilla; gray color), ch (Himalayan; white with black extremities), and c (albino; all white). The C allele is dominant to all others, cch is dominant to ch and c, ch is dominant to c, and c is recessive to all the other alleles. This dominance hierarchy can be summarized as C > cch > ch > c. Indicate the phenotypic ratios expected if rabbits with the cross Ccch ´ Cch.

1 chinchilla:1 Himalayan

1 full color:1 Himalayan

2 full color:1 Himalayan:1 albino

1 full color:1 chinchilla

3 full color:1 chinchilla

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Answer #1

C cch × C ch

Gametes C ch
C CC full colour Cch full colour
cch Ccch full colour cchch chinchilla

Phenotypic ratio =

3 (full colour) : 1 (chinchilla)

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