Allele frequencies with the Hardy–Weinberg equations

Question 1

In a population, 9 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer 

Question 2

The frequency of a recessive allele in a population is q = 0.3. What percentage of the population are expected to be heterozygous carriers (2pq)?

Answer %

Question 3

Which condition is NOT needed for Hardy–Weinberg equilibrium?

• A. strong natural selection on the gene
• B. a very large population
• C. no migration in or out
• D. random mating

Question 4

In a population, 1 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer 

Question 5

The frequency of a recessive allele in a population is q = 0.4. What percentage of the population are expected to be heterozygous carriers (2pq)?

Answer %

Question 6

Allele frequencies in a population change over generations. What does this show?

• A. The population is evolving
• B. The population is extinct
• C. Hardy–Weinberg equilibrium
• D. No mutations ever happen

Question 7

In a population, 25 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer 

Question 8

The frequency of a recessive allele in a population is q = 0.2. What percentage of the population are expected to be heterozygous carriers (2pq)?

Answer %

Question 9

Allele frequencies in a population change over generations. What does this show?

• A. No mutations ever happen
• B. Hardy–Weinberg equilibrium
• C. The population is extinct
• D. The population is evolving

Question 10

In a population, 16 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer 

Question 11

The frequency of a recessive allele in a population is q = 0.1. What percentage of the population are expected to be heterozygous carriers (2pq)?

Answer %

Question 12

Why can recessive alleles for harmful conditions stay in a population for many generations?

• A. Most copies are hidden in healthy heterozygous carriers
• B. They mutate back every generation
• C. Recessive alleles cannot be inherited
• D. Natural selection always favours them

Question 13

In a population, 25 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer 

Question 14

The frequency of a recessive allele in a population is q = 0.4. What percentage of the population are expected to be heterozygous carriers (2pq)?

Answer %

Question 15

Which condition is NOT needed for Hardy–Weinberg equilibrium?

• A. a very large population
• B. random mating
• C. no migration in or out
• D. strong natural selection on the gene

Question 16

In a population, 4 % of individuals show a recessive phenotype (aa). Assuming Hardy–Weinberg equilibrium, what is the frequency of the recessive allele, q?

Answer