In hares, the allele for short hair is dominant over the allele for long hair. A short haired male and long-haired female have bunnies. Eight bunnieshave short hair and 3 have long hair. (3)(a)What are the genotypes of the parents?(b)What is the expected ratio of Short to Long haired hares?(c)What is the actual ratio in this case?
Answers
1) The genotype of the parents are:
Male: Hh
Female: hh
2) Expected ratio of short to long-haired 1:1
3) Actual ratio short to long-haired 8:3
Explanation:
Assuming that the allele responsible for long hair is 'h'
and the allele responsible for short hair is 'H'.
The allele for short hair is dominant over that of long hair.
Given:
F1 generation = 8 short hair bunnies, 3 long hair bunnies.
So, to get both the genotype of parents:
Female has long here meant she will have both 'h' alleles because if 'H' was present she would have short hair. The genotype of female is 'hh'.
And, for the F1 generation to have expressed recessive allele 'h', the male with short hair must have one 'h' allele.
Hence the genotype of the male is 'Hh'.
2) The expected ratio if the parents have genotype Hh and hh is 2:2, which can be written as 1:1 in simplest form.
3) The actual ratio, in this case, is: Short hair to long hair = 8:3
