Question 1

Which of the following best defines 'evolution' in the context of biology?

Accepted Answer

The change in the genetic composition of a population over successive generations.

Question 2

Which evidence for evolution is best demonstrated by the similarity in bone structure between the human arm and a bat wing?

Accepted Answer

Comparative anatomy

Question 3

Charles Darwin’s theory of evolution by natural selection is based on which of the following principles?

Accepted Answer

Individuals with advantageous traits are more likely to survive and reproduce.

Question 4

Which of the following is NOT a criterion for natural selection?

Accepted Answer

Unlimited resources for all individuals

Question 5

A population of moths changes color from light to dark over several generations due to increased pollution. This is an example of:

Accepted Answer

Directional selection

Question 6

Which of the following scenarios best illustrates artificial selection?

Accepted Answer

Farmers breed cows that produce more milk.

Question 7

Which type of natural selection favors individuals at both extremes of a trait distribution?

Accepted Answer

Disruptive selection

Question 8

A small group of individuals leaves a population and establishes a new colony. The genetic makeup of the new colony is different from the original population due to:

Accepted Answer

Founder effect

Question 9

Which evolutionary mechanism is most likely to increase genetic variation within a population?

Accepted Answer

Mutation

Question 10

If a population experiences a drastic reduction in size due to a natural disaster, resulting in a loss of genetic diversity, this is known as:

Accepted Answer

Bottleneck effect

Question 11

Which of the following equations represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

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

Question 12

A population of rabbits has the following genotype frequencies: 0.36 AA, 0.48 Aa, and 0.16 aa. What are the allele frequencies of A and a?

Accepted Answer

$$A = 0.6, a = 0.4$$

Question 13

Which of the following is an example of gene flow?

Accepted Answer

Individuals from one population migrate and breed with another population.

Question 14

Non-random mating in a population will most likely result in:

Accepted Answer

Decreased genetic diversity

Question 15

Which of the following best describes stabilizing selection?

Accepted Answer

Selection that favors average phenotypes and reduces variation.

Question 16

A scientist observes that embryos of fish, birds, and humans all have pharyngeal pouches at some stage of development. This observation supports evolution through:

Accepted Answer

Comparative embryology

Question 17

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

Accepted Answer

Finches with either very large or very small beaks survive better than those with medium-sized beaks.

Question 18

Which mechanism of evolution is most likely to cause a population to become more similar to a neighboring population?

Accepted Answer

Gene flow

Question 19

If $$p = 0.7$$ and $$q = 0.3 in a $$population, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 0.42$$

Question 20

Which of the following statements about genetic drift is TRUE?

Accepted Answer

It is a random change in allele frequencies, often significant in small populations.

Chapter 13: How Populations Evolve – Study Guide

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