Question

In rabbits, short hair is due to a dominant allele, S, and long hair to its recessive allele, s. Black hair is due to a dominant allele, B, and white hair to its recessive allele, b. When two rabbits are crossed, they produce 2518 short-haired, black offspring and 817 long-haired, black offspring. What are the possible genotypes of the parents?

Answer 1

Answer:

SsBB  and SsBB

or

SsBB and SsBb

Explanation:

To produce a ratio of offspring where the number of short haired black offspring is three times that of the long haired black offspring. Since, the long haired offspring can only be inherited in the recessive manner in two copies, thus possible genotypes of the parents could be:

SsBB  and SsBB

or

SsBB and SsBb

SsBB  and SsBB

         SB      sB

SB    SSBB   SsBB

sB     SsBB   ssBB

3/4 short haired black offspring and 1/4 long haired black offspring

SsBB and SsBb

          SB        Sb      sB       sb

SB    SSBB  SSBb  SsBB   SsBb

sB     SsBB  SsBb   ssBB    ssBb

6/8=3/4 short haired black offspring and 2/4=1/4 long haired black offspring