Question 1

Which of the following evolutionary mechanisms is most likely to increase genetic variation in a population by introducing new alleles?

Accepted Answer

Mutation

Question 2

A population of birds is split by a mountain range, and pollen from one side occasionally fertilizes plants on the other side. Which evolutionary process is primarily occurring?

Accepted Answer

Gene flow

Question 3

Which type of selection is most likely to result in the formation of two distinct species from a single population?

Accepted Answer

Disruptive selection

Question 4

In a population bottleneck, which of the following is most likely to occur?

Accepted Answer

Disproportionate effect of genetic drift

Question 5

Which equation best represents the fixation of a favored allele under directional selection?

Accepted Answer

$$p = 1.0$$

Question 6

A rare genetic disorder is unusually common in a small, isolated human community due to their ancestors being a small group of founders. This is an example of:

Accepted Answer

Founder effect

Question 7

Which of the following statements about genetic drift is TRUE?

Accepted Answer

It is more pronounced in small populations.

Question 8

In stabilizing selection, what happens to the average value of a trait over time?

Accepted Answer

It remains unchanged

Question 9

Which process is responsible for restoring genetic diversity by creating new alleles, but is usually slow compared to other evolutionary mechanisms?

Accepted Answer

Mutation

Question 10

A population of insects is exposed to a new pesticide. Over several generations, the frequency of a resistance allele increases until it becomes fixed. Which type of selection is this?

Accepted Answer

Directional selection

Question 11

Sexual selection differs from natural selection in that it:

Accepted Answer

Acts more strongly on males than females, leading to sexual dimorphism

Question 12

Which of the following is NOT a source of genetic variation?

Accepted Answer

Genetic drift

Question 13

In the context of sexual selection, female mate choice is often based on:

Accepted Answer

Male physical characteristics and resources provided

Question 14

Which evolutionary process can lead to reduced fitness in a population by introducing low-fitness alleles from another population?

Accepted Answer

Gene flow

Question 15

Which of the following best describes the effect of disruptive selection on genetic diversity?

Accepted Answer

It maintains genetic diversity by favoring extreme phenotypes.

Question 16

A population of seals experiences a sudden decrease in numbers due to a disease outbreak. The remaining seals have less genetic variation than the original population. This scenario illustrates:

Accepted Answer

Population bottleneck

Question 17

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

Accepted Answer

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

Question 18

Which evolutionary process is most likely to cause random changes in allele frequencies that do NOT result in adaptation?

Accepted Answer

Genetic drift

Question 19

In male-male competition, which factor is most likely to determine which males reproduce?

Accepted Answer

Success in combat or control of territories

Question 20

Which of the following is a consequence of directional selection over many generations?

Accepted Answer

Fixation of favored alleles and reduction in genetic diversity

Evolutionary Processes: Mechanisms and Patterns of Evolution

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