1 Short hair is due to a dominant gene S in rabbits and long

1. Short hair is due to a dominant gene (S) in rabbits and long hair is its recessive allele (s). A cross between a short-haired male and a long-haired male produced a litter of one long-haired and seven short-haired bunnies.

a) What ate the genotypes of the parents?

b) What phenotype ratio was expected on the offspring generation?

c) How many of the eight bunnies were expected to be long-haired?

2. The lack of pigmentation in humans called albinism is the result of a recessive gene and normal pigmentation if the result of its dominant allele. Two normal parents have an albino child. Determine the probability that the next child will be an albino.

Explain your answers.

Solution

Answer:

(a)

a) What are the genotypes of the parents?

short-haired male (Ss) or (SS) X long-haired male (ss)

b) What phenotype ratio was expected on the offspring generation?

P1 = Ss X ss

F1 = Ss, Ss,ss,ss

1short-haired:1 long-haired male

c) How many of the eight bunnies were expected to be long-haired?

4 of the eight bunnies were expected to be long-haired

2. The lack of pigmentation in humans called albinism is the result of a recessive gene and normal pigmentation if the result of its dominant allele. Two normal parents have an albino child. Determine the probability that the next child will be an albino.

Explain your answers.

Answer:

Albino gene = a

Normal pigmentation= A

P1 =Aa X Aa

Chances of first child being albino = ¼

Chances of second child being albino = ¼ x ¼ =1/16