Question

31. 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 over all others, cch is dominant over ch and c, ch is dominant over c, and c is recessive to all the other alleles. This dominance hierarchy can be summarized as C >ch >c"> c. The rabbits in the list on the following page are crossed and produce the progeny shown. Give the genotypes of the parents for each cross.

Answer 1

A. full colour and albino cross gives half albino so the genotypes have to be Cc for full colour and cc for albino.

b here half himalayan and half albiono is seen so the genotypes are c^hc and cc

c here the genotypes will be Cc^ch for the chinchilla and for albino it will always be cc

d here the genotypes will be Cc for the full colour and for himalayan it will be c^hc so the cross will also produce 1/4 cc that is albino

e here full colour crosses gives albino 1/4 th offspirings so the full colour must be Cc and Cc