A population has a total of two alleles, G and g, for a given gene. Which one of the following sets of genotype frequencies is correctly expressed for that population?
A) GG = .25 Gg = .75 gg = .35
B) GG = .70 Gg = .25 gg = .30
C) GG = .75 Gg = .15 gg = .10
D) GG = .45 Gg = .15 gg = .75

Question

Quizplus · Accepted Answer

A population can have a total of two alleles for a given gene, which are represented by letters, usually uppercase and lowercase. In this case, the two alleles are G and g.

The genotype frequencies represent the proportion of individuals in the population that have a particular combination of alleles.

In option A, the sum of the genotype frequencies is greater than 1, which is not possible.

In option B, the sum of the genotype frequencies is also greater than 1.

In option D, the frequency of the gg genotype is greater than 1, which is not possible.

Option C is the only one where the sum of the genotype frequencies is equal to 1, which is the total frequency of all possible genotypes. Therefore, it is the correct set of genotype frequencies for the given population.

A Population Has a Total of Two Alleles, G and G