On the planet Trogus, the population of Trogites have an autosomal gene, HDZ, with two alleles, T and t. T is dominant to t. Ind

Question

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On the planet Trogus, the population of Trogites have an autosomal gene, HDZ, with two alleles, T and t. T is dominant to t. Ind

ividuals 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

Biology

1 answer:

s2008m [1.6K] · Answer 1 · 2026-03-06T05:43:42+03:00

Answer:

The chance is 0.25 or 25%

Explanation:

To determine the answer, one should utilize a Punnett Square. This tool illustrates the genetic combinations produced from the mating of two parent organisms, allowing visualization of how their alleles combine in offspring. The Punnett Square consists of a grid with eight boxes; one parent's alleles are arranged along the top row, and the other's are positioned down the first column. Each allele from one parent matches with the alleles from the other, filling in the remaining boxes. This results in a genetic probability for the potential offspring's traits.

For the question posed, the cross involving parents who both have Tt (Tt x Tt) alleles is represented below, using the Punnett Square.

T t

T TT Tt

t Tt tt

Within these results, we see that "tt" appears just once among the four possible offspring. Thus, we have a ratio of 1/4, which converts to 0.25, indicating a 25% likelihood that the offspring from this cross will exhibit the "tt" genotype.