Normal length of fur in rabbit is controlled by the dominant allele R, and a short type of

fur called "rex" is determined by the recessive allele r. The dominant allele B is responsible for black fur colour, while the recessive allele b determine brown.

a Show a dihybrid cross between a homozygous rabbit with normal-length black fur and rex rabbit with brown fur. What are the phenotypic ration resulting from this

CROSS?

b. What proportion of the normal, black rabbit in the Fa generation of this cross can

be expected to be homozygous for both pairs of genes? c. What would be the expected phenotypic and genotypic results of a back cross between a member of the F1 generation and a fully recessive rex, brown parent?