Question

Cats have a gene that codes for the colour of their fur.Suppose that a certain breed of cat can have black, gray, or white fur. Black fur is dominant, white fur is recessive, and gray fur is intermediate (i.e., cats with gray fur possess one allele for black fur and one for white fur).If agray a cat and a white cat have kittens,what phenotype could the kitten exhibit?

Answer 1

Phenotype of the kitten exhibit

Explanation:

• By the help of Punnet square  Let's call black 'B' and white 'b'

• Being intermediate, gray cats will have the alleles 'Bb'

• Being recessive, white cats will have the alleles 'bb'

• Cross between black and white colour: B X b=Bb            
•  punnet square:                

                       B     b  

                   b  Bb   bb

                   b   Bb   bb

• Bb = Gray

• bb = White

• So the cats can have gray or white fur
• hence, the right answer is "gray or white fur".