2. In rabbits, black hair depends on a dominant allele, B, and brown on a recess

Question

2. In rabbits, black hair depends on a dominant allele, B, and brown on a recessive allele, b. Short hair is due to a dominant allele, S, and long hair to a recessive allele, s. If a homozygous black, homozygous short-haired male is mated with a brown, long-haired female, what will their offspring look like? What will be the genotypes of the offspring? If two of these F? rabbits mated, what phenotypes would you expect among their offspring, in what proportion? BIG HINT: this is a dihybrid, first starting from the parental generation.

Explanation / Answer

Parent                   (Male) BBSS         X       bbss (Female)

Genotype                        B S              X                 b s

F1 Generation                                    BbSs (Short hair with Black colour)

CROSS                           BbSs            X       BbSs

Ganete                            BS               Bs              bS                bs

F2 Generation:      BS     BBSS          BBSs           BbSS           BbSs

                                      

Bs      BBSs           BBss            BbSs            Bbss

bS      BbSS           BbSs            bbSS            bbSs

bs      BbSs            Bbss             bbSs            bbss            

Phenotype

Black Short: 9

Black Long : 3

Brown Short: 3

Brown Long: 1

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