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 genotyped individuals, in the F2population of individuals who prefer sorbet, what is the probability that a random individual has the Tt genotype?

A. 0.991.

B. 0.141.

C. 0.435.

D. 0.044.

E. 0.522.

Answer 1

Answer:

The correct option is C. 0.435

Explanation:

To get the results, let's make a punnet square and check the results. The parents in the cross will be heterozygous prefering sorbet. We can say that the alleles for sorbet are dominant over the alleles which prefer ice cream.

          T        t

T        TT       Tt

t         Tt        tt

The results show that there is 25% (0.25) probability that the individual will be homozygous preferring sorbet (TT). 25% (0.25) will have the probability of preferring ice- cream (tt).

50% (0.5) which is nearest to 0.435 will have the probability for having heterozygous alleles (Tt) and preferring sorbet,