2. In cats, hair length is a trait that is controlled by a gene with 2 alleles.

Question

2. In cats, hair length is a trait that is controlled by a gene with 2 alleles. The dominant allele codes for a protein that produces short hair, and the recessive allele codes for a protein that produces long hair. Two cats are mated and the male parent is long-haired. The litter which results contains two short-haired and three long-haired kittens.
a. What does the second parent look like, and what is its genotype?
b. State all the kitten genotypes and phenotypes that are possible from a mating of these two parents, and the probability of getting each genotype and phenotype?

Explanation / Answer

Two cats are mated and the male parent is long-haired. The litter which results contains two short-haired and three long-haired kittens

male parent is long-haired.------genotype-----ss

female parent is short hair.------genotype-----Ss

genotype-----Ss             X      -genotype-----ss

S

s

s

Ss

short hair,

ss

long-haired

s

Ss

short hair,

ss

long-haired

Probability of genotype---- ss long-haired---50%

Probability of genotype---- Ss -----short hair,---50%

S

s

s

Ss

short hair,

ss

long-haired

s

Ss

short hair,

ss

long-haired

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