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

Question

1. 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. (a) (0.5 point) If a cat has black fur, what is(are) its possible genotype(s)?   

(b) (0.5 point) If a cat has brown fur, what is(are) its possible genotype(s)?   

3. A Bb cat is crossed with another Bb cat. (a) (0.5 point) What percentage of the kittens are predicted to have black fur?

(b) (0.5 point) What percentage of the kittens are predicted to have a Bb genotype?   

4. (0.5 point) 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

Explanation / Answer

1 a). The possible genotype s for black fur are BB and BB.

b). The possible genotype for a cat with brown fur is only bb as it is a recessive trait and expressed only when dominant allele B is not present.

3 a) when a BB cat is crossed with another BB cat the kittens will have following genotype

BB. Bb. Bb. bb

As black fur is dominant trait all kittens except bb will have black fur . It means 3/4 kittens ( 75 percent) will have black fur.

B) as there are 2/4 kittens with BB genotype it's percentage is 50 percent.

4) appearance of cat with genotype BbSs. Black fur with white spots.

Appearance of cat with genotype bbSs. Brown fur with white spots.

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