Question 1

Which of the following best describes Darwin’s concept of 'descent with modification'?

Accepted Answer

Species accumulate differences from their ancestors as they adapt to different environments over generations.

Question 2

Which observation led Darwin to infer that individuals with advantageous traits tend to leave more offspring?

Accepted Answer

Members of a population often vary in their inherited traits.

Question 3

Why is evolution by natural selection not considered a random or progressive process?

Accepted Answer

Natural selection acts on existing variation, favoring traits that increase survival and reproduction in a specific environment.

Question 4

Which of the following is an example of artificial selection?

Accepted Answer

The development of different vegetables (e.g., cabbage, broccoli, kale) from wild mustard by selective breeding.

Question 5

Which mechanism is the ultimate source of genetic variation in populations?

Accepted Answer

Mutation

Question 6

Why is genetic drift more impactful in small populations than in large populations?

Accepted Answer

Chance events can cause larger changes in allele frequencies in small populations.

Question 7

Which of the following best illustrates convergent evolution?

Accepted Answer

The similar body shapes of dolphins (mammals) and sharks (fish) due to adaptation to aquatic environments.

Question 8

Which statement about natural selection is correct?

Accepted Answer

Natural selection acts on traits already present in the population.

Question 9

A population of insects is split by a river, and over time, the two groups accumulate genetic differences. Which evolutionary mechanism is most likely responsible for the initial divergence?

Accepted Answer

Genetic drift

Question 10

Which of the following is NOT a type of evidence supporting the theory of evolution?

Accepted Answer

The fixity of species as proposed by Aristotle

Question 11

Which of the following best explains why MRSA (methicillin-resistant Staphylococcus aureus) has become more common in hospitals?

Accepted Answer

Natural selection favors bacteria with pre-existing resistance genes when methicillin is used.

Question 12

Which of the following is an example of a homologous structure?

Accepted Answer

The wings of a bat and the arms of a human, both containing similar bone arrangements.

Question 13

Which process is described by the transfer of alleles between populations?

Accepted Answer

Gene flow

Question 14

A scientist finds that two species of mammals on different continents have similar body shapes and behaviors, but are not closely related. What is the most likely explanation?

Accepted Answer

Convergent evolution due to similar environmental pressures

Question 15

Which of the following statements about mutation is correct?

Accepted Answer

Mutation is random with respect to fitness.

Question 16

Which of the following equations represents the change in allele frequency due to genetic drift in a small population?

Accepted Answer

$$\Delta p = \frac{1}{2N}$$

Question 17

Which scenario best illustrates the concept of gene flow?

Accepted Answer

Birds from one island migrate to another, introducing new alleles into the recipient population.

Question 18

Which of the following is a key difference between Lamarck’s and Darwin’s explanations for the evolution of long necks in giraffes?

Accepted Answer

Lamarck proposed that acquired traits are inherited, while Darwin proposed that inherited variation is acted upon by natural selection.

Question 19

Which of the following best describes the fossil record’s contribution to evolutionary theory?

Accepted Answer

It provides evidence for the extinction of species, the origin of new groups, and changes within groups over time.

Population Genetics I: Descent with Modification and the Mechanisms of Evolution

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