Question 1

Which of the following best describes allopatric speciation?

Accepted Answer

Speciation that results from the presence of a geographic barrier separating populations.

Question 2

A population of rodents is separated by a newly formed canyon, preventing gene flow. Over time, the two groups evolve into distinct species. This is an example of:

Accepted Answer

Allopatric speciation

Question 3

Which of the following is NOT a mechanism that can lead to sympatric speciation?

Accepted Answer

Geographic isolation

Question 4

Polyploidy is most commonly associated with speciation in which group of organisms?

Accepted Answer

Plants

Question 5

Which of the following best explains why hybrid zones can persist over time?

Accepted Answer

Selection does not favor either hybrids or non-hybrids, allowing both to reproduce.

Question 6

A karyotype showing an organism with three sets of chromosomes (3n) is an example of:

Accepted Answer

Triploidy

Question 7

Which equation correctly represents the chromosome number in a tetraploid organism, if the diploid number is $$2n$$?

Accepted Answer

$$4n$$

Question 8

In Lake Victoria, cichlid fish have speciated due to differences in male coloration. This is an example of:

Accepted Answer

Sexual selection

Question 9

Which of the following statements about reinforcement in hybrid zones is TRUE?

Accepted Answer

Reinforcement leads to strengthening of reproductive barriers when hybrids are less fit than parent species.

Question 10

Which scenario best illustrates fusion in a hybrid zone?

Accepted Answer

Two species merge into one due to breakdown of reproductive barriers.

Question 11

A North American maggot fly population begins to live on recently introduced apple trees instead of native hawthorn trees. This is an example of:

Accepted Answer

Habitat differentiation

Question 12

Which of the following is a key difference between allopatric and sympatric speciation?

Accepted Answer

Allopatric speciation requires geographic isolation, while sympatric speciation does not.

Question 13

Which of the following is an example of an intrinsic reproductive barrier?

Accepted Answer

Temporal isolation due to different mating seasons

Question 14

Which of the following is NOT a possible outcome when closely related species meet in a hybrid zone?

Accepted Answer

Polyploidy

Question 15

If the rate of hybridization decreases over time in a hybrid zone, which process is most likely occurring?

Accepted Answer

Reinforcement

Question 16

Which of the following best describes the concept of punctuated equilibrium?

Accepted Answer

Species remain unchanged for long periods, interrupted by brief periods of rapid change.

Question 17

Which of the following is a real-world example of allopatric speciation?

Accepted Answer

Snapping shrimp species separated by the Isthmus of Panama.

Question 18

Which of the following equations represents the chromosome number in a hexaploid organism, if the diploid number is $$2n$$?

Accepted Answer

$$6n$$

Question 19

Which of the following statements about hybrid fitness is TRUE?

Accepted Answer

Hybrids often have reduced fitness compared to parent species.

Question 20

Which of the following is a visual representation of an organism’s complete set of chromosomes?

Accepted Answer

Karyotype

Speciation: Mechanisms and Patterns in the Origin of Species

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