In cats, the B gene controls the production of hair pigment. The B allele, which

Question

In cats, the B gene controls the production of hair pigment. The B allele, which is dominant, specifies black fur. The recessive b allele produces brown fur.

1) In cats, the dominant S allele causes white spots. The recessive s allele does not affect fur color. Describe the appearance of the cats having the following genotypes:

BbSs

bbSs

2) A BBSs cat is crossed with a bbss cat. (a) Draw a Punnett square for the cross.

(b) List all the possible phenotypes of the kittens and give the expected percentage of each phenotype.

Explanation / Answer

Answer:

Based on the given information:

1) Appearance of cats with following genotype:

BbSs - These cats will be having black fur with white spots (as one dominant allele of both fur color B and spots S is present)

bbSs - These cats will be having brown fur (since both alleles are recessive) with white spots (as one allele is dominant for white spots)

2) BBSs cat is crossed wih bbss cat

Punnett square for the cross is:

All possible phenotypes are expected percentage of each phenotype is:

BbSs - Black fur with White Spots - 8/16 = 0.5 or 50%

Bbss - Black fur with no affect on fur color - 8/16 or 50%

BS Bs BS Bs bs BbSs Bbss BbSs Bbss bs BbSs Bbss BbSs Bbss bs BbSs Bbss BbSs Bbss bs BbSs Bbss BbSs Bbss

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