In a study of the alcohol dehydrogenase (ADH) enzyme in a population of Drosophi

Question

In a study of the alcohol dehydrogenase (ADH) enzyme in a population of Drosophila melanogaster, a researcher finds the following genotype frequencies for the Fast (F) and Slow (S) alleles of the gene.

FF                               FS                                SS

0.81                             0.18                             0.01

What are the allele frequencies of F and S?

a. F = 0.5, S = 0.5

b. F = 0.09, S= 0.91

c. F = 0.9, S= 0.1

d. F = 0.81, S = 0.19

Now a toxin is released into the environment that kills off all FF genotype flies in the population. What are the new allele frequencies after this selection event?

a. F = 0.474, S = 0.526

b. F = 0.18, S = 0.1

c. F = 0.9, S= 0.1

d. F = 0.5, S = 0.5

Explanation / Answer

1) c. F = 0.9, S= 0.1

Frequency of F = f(FF) + 1/2 * f(FS) = 0.81+0.09 = 0.9

Frequency of S = f(SS) + 1/2 * f(FS) = 0.01+0.09 = 0.1

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

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