BET Practice Quiz

Question 1

In a large randomly mating population, 9% of individuals express a recessive trait aa. Assuming Hardy-Weinberg equilibrium, what is the frequency of the dominant allele A?

Accepted Answer

0.7

Question 2

If the frequency of allele B is 0.4 in a Hardy-Weinberg population, what is the expected frequency of heterozygotes Bb?

Accepted Answer

0.48

Question 3

In a population, the frequency of a recessive lethal allele l among newborns is q = 0.2. If ll individuals die before reproducing, what is the frequency of l among the surviving adults, assuming selection is the only force acting during that interval?

Accepted Answer

0.167

Question 4

Two subpopulations are each in Hardy-Weinberg equilibrium for allele A. Subpopulation 1 has p = 0.2 and subpopulation 2 has p = 0.8, and they contribute equal numbers of individuals to a pooled sample. What is the expected heterozygote frequency in the pooled sample before random mating occurs?

Accepted Answer

0.32

Question 5

In a sample of 1000 individuals, 360 are AA, 480 are Aa, and 160 are aa. Which statement is correct regarding Hardy-Weinberg equilibrium?

Accepted Answer

The population is exactly in Hardy-Weinberg equilibrium because observed heterozygotes equal 2pq.

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