A hypothetical population has two alleles for an “T” gene: T and t . In a random

Question

A hypothetical population has two alleles for an “T” gene: T and t. In a random sample of 50 diploid zygotes (for a total of ____ alleles), the following genotypes were found: 15 TT, 25 Tt, and 10 tt.

Let’s say that natural selection acts against the t allele in the initial population sampled above, and all 10 individuals with tt genotype die off (leaving 0 tt individuals) and 10 of the individuals with Tt genotype die off (leaving 15 Tt individuals) before reaching maturity. (The number of surviving adults in the population is 30).

What is the new frequency of the recessive allele after selection occurred?

0.75

0.25

0.50

0.10

0.75

0.25

0.50

0.10

Explanation / Answer

The number of surviving adults = 30

Heterozygous individuals survived (Tt) = 15

heterozygous allele frequency (2pq) = 15/30 = 1/2 = 0.5

Hence, new frequency of recessive allele after selection = 0.5

Option C is correct.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.