Question 1

Which of the following best describes microevolution?

Accepted Answer

A change in allele frequencies in a population over generations

Question 2

In the context of the Hardy-Weinberg equilibrium, what does the equation $$p + q = 1$$ represent?

Accepted Answer

The sum of allele frequencies at a locus in a population

Question 3

A population of flowers has 320 red (CRCR), 160 pink (CRCW), and 20 white (CWCW) individuals. What is the frequency of the CR allele?

Accepted Answer

0.80

Question 4

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

Accepted Answer

Natural selection

Question 5

What is the expected frequency of heterozygous genotype $$CRCW in a $$population where $$p = 0.8$$ and $$q = 0.2$$?

Accepted Answer

$$0.16$$

Question 6

Which mechanism of evolution is most likely to reduce genetic variation in a small population due to random loss of alleles?

Accepted Answer

Genetic drift

Question 7

A population of bacteria is exposed to antibiotics. Over time, the population becomes mainly resistant. Which evolutionary mechanism is illustrated?

Accepted Answer

Natural selection

Question 8

Which of the following statements about mutations is correct?

Accepted Answer

Mutations in gamete-producing cells can be passed to offspring

Question 9

In sickle-cell disease, a single amino acid change in the hemoglobin protein leads to altered red blood cell shape. This is an example of:

Accepted Answer

A mutation affecting phenotype

Question 10

Which equation represents the expected genotype frequencies in Hardy-Weinberg equilibrium?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 11

Sexual selection can result in sexual dimorphism. Which of the following is an example of sexual dimorphism?

Accepted Answer

Male peacocks with large, colorful tails compared to females

Question 12

Which of the following best explains why genetic drift is more significant in small populations?

Accepted Answer

Random events can cause large changes in allele frequencies

Question 13

Gene flow can affect adaptation to local environments. Which scenario best illustrates this?

Accepted Answer

A population of water snakes with banding patterns adapted to both mainland and island habitats

Question 14

If a population is in Hardy-Weinberg equilibrium, what does this indicate about the population?

Accepted Answer

Allele and genotype frequencies remain constant from generation to generation

Question 15

Which of the following is a real-world example of natural selection?

Accepted Answer

Antibiotic resistance evolving in bacterial populations

Question 16

A population of butterflies has blue, green, and brown color morphs. If the population remains unchanged over several generations, which condition is most likely met?

Accepted Answer

Hardy-Weinberg equilibrium

Question 17

Which factor is most likely to cause harmful alleles to become fixed in a population?

Accepted Answer

Genetic drift

Question 18

In a population of mice, the frequency of allele A is $$p = 0.7$$ and allele a is $$q = 0.3. $$What is the expected frequency of heterozygotes ($$Aa) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$0.42$$

Question 19

Which of the following best describes the effect of gene flow on populations?

Accepted Answer

It can alter allele frequencies by moving alleles into or out of populations

Question 20

Which scenario best illustrates the process of adaptive evolution?

Accepted Answer

Traits that enhance survival or reproduction increase in frequency over time

Evolution of Populations: Mechanisms, Genetic Variation, and Hardy-Weinberg Equilibrium

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