In rabbits a normal coat is dominant over a satin coat. Cross a homozygous domin

Question

In rabbits a normal coat is dominant over a satin coat. Cross a homozygous dominant normal rabbit with one with a satin coat. What are the phenotype and genotype ratios of the F1 generation? Cross two of the F1 offspring with each other. What are the genotype and phenotype ratios of the F2 generation offspring? Show all of your work. For the normal coated rabbits in the F2 generation of problem 1, how could you determine which ones are homozygous dominant and which ones are heterozygous? Show your work and explain how you interpret the answer.

Explanation / Answer

Ques-1 & 2:

The monohybrid cross of Parent A (homozygous dominant - SS) with Parent B (ss/satin coat – homozygous recessive) generates 3:1 ratio of dominant : recessive phenotypes. Therefore, the following the crosses that generates this types of ratio

SS                                X             ss

S                 S                         s              s

Ss           Ss                        Ss        Ss ---> F1 generation all are "heterozygous dominant normal coat-phenotypes" now cross between two heterozygous F1 phenotypes (1:1:1:1)

Ss                                  x                       Ss

S                       s                       S               s

SS           Ss       Ss         ss ---> F2- phenotype ration ---> 3:1 (normal coat : satin) where as F2 genotype ratio ---> 1:2:1

SS --> Dominant --> homozygous alleles --> normal coat

Ss --> Dominant --> heterozgous alleles --> normal coat

ss --> recessive --> homozygous alleles --> satin coat

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