On the planet Trogus, the population of Trogites have an autosomal gene, HDZ, wi
ID: 133034 • Letter: O
Question
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 genotypes, among the F2 population of individuals who prefer ice cream, what is the probability that a random individual has the tt genotype?
A. 0.667.
B. 0.041.
C. 0.215.
D. 0.001.
E. 0.333.
Explanation / Answer
The correct answer is E. 0.333.
Explanation - F2 generation will be TT Tt Tt tt
Assume a population size of 100, 25 will be TT, 50 wil be Tt and 25 will be tt.
The question asked is, what is the probability of tt genotype in the F2 generation who prefer Ice Cream.
Probability of tt = Number of tt / Total = 23.75 / 71.25 = 0.333
Genotype Population % who prefer Ice Cream Population who prefer Ice Cream TT 25 40 10 Tt 50 75 37.5 tt 25 95 23.75Related Questions
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