Question

A. 0.667.

B. 0.995.

C. 0.140.

D. 0.333.

E. 0.001

On the planet Trogus, the population of Trogites have an autosomal gene, HDZ, with two alleles, T and t. T is dominant to t. Individuals with the T allele in their genotype show a propensity for sorbet, while the remainder prefer ice cream. In multiple population studies, 60% of individuals with the TT genotype prefer sorbet, 25% of Tt individuals prefer sorbet, and 5% of tt individuals prefer sorbet. In an F1 cross of Tt x Tt genotyped individuals, among the F2 population of individuals who prefer ice cream, what is the probability that a random individual has the TT genotype?

Answer 1

Given, Individuals with the T allele in their genotype show a propensity for sorbet,

T allele in their genotype show a propensity for ice-cream.

60% of individuals with the TT genotype prefer sorbet

25% of Tt individuals prefer sorbet

5% of tt individuals prefer sorbet

Tt X Tt

TT, Tt, Tt, tt

According to Mandel 25% should prefer ice-cream, but it is given that 5% prefer sorbet.

and 40% of TT prefer icecream.

So out of 25% of total individual 40% like icecream

So the percentage of TT liking icecream = 10% = 1/10

So the probability random individual with TT genotype who like icecream will be

So out of 100% the probability of individual with TT and liking icecream will be = 0.1/100 = 0.001.