Question 1

Which of the following best describes gene flow in a population?

Accepted Answer

A change in allele frequency due to the gain (immigration) or loss (emigration) of alleles between populations.

Question 2

In the context of gene flow, what is the most likely outcome when two populations with different allele frequencies experience migration between them?

Accepted Answer

The allele frequencies in both populations will become more similar over time.

Question 3

Which real-world example demonstrates the spread of advantageous alleles through gene flow?

Accepted Answer

The spread of insecticide resistance in mosquitos across geographic regions.

Question 4

If a population of beetles with black wings and a population with white wings begin to interbreed, what would you expect to happen to the allele frequencies for wing color over time?

Accepted Answer

The allele frequencies for wing color will become more similar in both populations.

Question 5

Which equation represents the Hardy-Weinberg equilibrium for a population with two alleles, $A$ and $a$, where $p$ is the frequency of $A$ and $q$ is the frequency of $a$?

Accepted Answer

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

Question 6

A population of mosquitos develops resistance to insecticide due to gene flow. Which of the following best explains how gene flow contributes to this phenomenon?

Accepted Answer

Gene flow spreads resistance alleles from one population to another, increasing the frequency of resistance.

Question 7

If a population is isolated and inbred, what effect can gene flow have on its fitness?

Accepted Answer

Gene flow can increase fitness by introducing new genetic variation.

Question 8

Which of the following is NOT a possible consequence of gene flow between wild and hatchery steelhead trout populations?

Accepted Answer

Complete genetic isolation between wild and hatchery populations.

Question 9

Which of the following statements about gene flow is correct?

Accepted Answer

Gene flow can either increase or decrease fitness depending on the alleles introduced.

Question 10

Consider two populations: Population 1 is homozygous for allele $A_1$ and Population 2 is homozygous for allele $A_2$. After several generations of gene flow, what is the most likely genetic outcome?

Accepted Answer

Both populations will become heterozygous for $A_1$ and $A_2$.

Question 11

Which of the following scenarios would most likely result in gene flow?

Accepted Answer

A population of birds migrates to a new area and breeds with the local population.

Question 12

Why is gene flow important for the spread of insecticide resistance in mosquitos?

Accepted Answer

It allows resistant alleles to move between populations, increasing the overall frequency of resistance.

Question 13

Which of the following is a direct result of gene flow between two populations?

Accepted Answer

Increased genetic similarity between the populations.

Question 14

If gene flow is restricted between two populations, what is the most likely long-term evolutionary outcome?

Accepted Answer

The populations may diverge and eventually become separate species.

Question 15

Which of the following best explains why gene flow can sometimes decrease the fitness of a population?

Accepted Answer

Gene flow introduces alleles that are maladaptive in the local environment.

Question 16

A scientist observes that after gene flow between two beetle populations, the frequency of a previously rare allele increases in both populations. What is the most likely explanation?

Accepted Answer

Gene flow allowed the allele to spread from one population to the other.

Question 17

Which of the following is NOT a mechanism by which gene flow can occur?

Accepted Answer

Random mutation within a single population.

Question 18

In a population where gene flow is high, which of the following is most likely to occur?

Accepted Answer

Populations will become more genetically similar.

Question 19

Which of the following statements about the effect of gene flow on evolution is correct?

Accepted Answer

Gene flow can introduce new alleles into a population, potentially increasing genetic variation.

Population Genetics and Evolutionary Processes: Gene Flow and Species Concepts

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