Genetics majors only please The frequency of the x-linked recessive allele for r
ID: 86829 • Letter: G
Question
Genetics majors only pleaseThe frequency of the x-linked recessive allele for red-green colour blindness is 0.25 in males of a population. Showing your calculations, determine the genotypic and phenotypic frequencies by gender of a population at equilibrium Genetics majors only please
The frequency of the x-linked recessive allele for red-green colour blindness is 0.25 in males of a population. Showing your calculations, determine the genotypic and phenotypic frequencies by gender of a population at equilibrium
The frequency of the x-linked recessive allele for red-green colour blindness is 0.25 in males of a population. Showing your calculations, determine the genotypic and phenotypic frequencies by gender of a population at equilibrium
Explanation / Answer
Colour blindness is an x-linked recessive trait. A male is hemizygous for the X chromosome, and this has only one copy of each trait. The frequency of an x-linked recessive in males is thus equal to the frequency of the allele in this population.
From this, we know that q = 0.25 and p = (1 – 0.25) = 0.75.
As female has two copies of each gene on the x chromosome so the equation for hardy weinberg equlibrium is the same as for the autosomal traits. In this case, a homozygous recessive female would occur at a frequency of q2 or 0.0625. A heterozygous female would occur at a frequency of 2pq = 2*0.75*0.25 = 0.375.
Genotypic frequencies of male in this population will be – (0.25)2 = 0.0625.
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