In rabbits an allelic series helps to determine coat color C

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 in rabbits with the cross cchch × chc.

1 full color:1 chinchilla

1 full color:1 Himalayan

1 chinchilla:1 Himalayan

3 full color:1 chinchilla

2 full color:1 Himalayan:1 albino

Solution

In these the four alleles occurs of coal colour rabbit; the C causes the \"fully coloured\" and the homogygous recessive traits causes cc is \"albino\" and there are two different allelic variation but of same locus i.e, (cch and ch), the genotypes (cchcch) is chinchila; the genotype (ch and ch) causes the himalayan pattern. and the genotypes like( cch cch, cch ch; cch c) rabbit has the chinchilla pattern whereas (ch ch; ch c) has the himalayan pattern

1 CC (full color); 2 Ccch (full color); 1 cch cch (1 chinchilla) Ratio 3 full color:1 chinchilla

b. Cch x chc

1 Cch (full color); 1 Cc (full color); 1 ch ch (Himalayan); 1 ch c (Himalayan) Ratio 1 full color: 1 Himalayan

c. cchch x chc

1 cch ch (chinchilla); 1 cch c (chinchilla); 1 ch ch (Himalayan); 1 ch c (Himalayan) Ratio 1 chinchilla:1 Himalayan

d. Cc x chc

1 Cch (full color); 1 Cc (full color); 1 cch (Himalayan); 1 cc (albino) Ratio 2 full color: 1 Himalayan; 1 albino

Therefore the phenotypic ratios expected in rabbits with the cross cchch x chc is 1 chinchilla: 1 himalayan