Question 1

Which of the following best describes the biological species concept?

Accepted Answer

A group of populations whose members can interbreed in nature and produce viable, fertile offspring.

Question 2

Which of the following is an example of a prezygotic reproductive isolating mechanism?

Accepted Answer

Temporal isolation between two skunk species that breed in different seasons.

Question 3

A population of frogs is separated by a newly formed river. Over time, the two populations evolve independently and can no longer produce viable offspring if brought together. This is an example of:

Accepted Answer

Macroevolution

Question 4

Which of the following equations represents the change in allele frequency in a population over time, a key concept in microevolution?

Accepted Answer

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

Question 5

Which scenario best illustrates mechanical isolation as a prezygotic barrier?

Accepted Answer

Two species of snails with shells spiraling in opposite directions cannot mate.

Question 6

Why are mules, the offspring of a horse and a donkey, considered an example of postzygotic isolation?

Accepted Answer

They are sterile and cannot produce offspring.

Question 7

Which of the following is NOT a prezygotic barrier?

Accepted Answer

Reduced hybrid fertility

Question 8

In a region where two closely related species of plants grow, one species is pollinated by bees and the other by hummingbirds. This is an example of:

Accepted Answer

Behavioral isolation

Question 9

Which of the following best explains why reproductive isolating mechanisms are considered a consequence of divergence rather than an adaptation evolved to prevent interbreeding?

Accepted Answer

They arise as a byproduct of genetic divergence and lack of gene flow.

Question 10

Which of the following is an example of hybrid breakdown?

Accepted Answer

F1 hybrids are viable and fertile, but F2 offspring are weak or sterile.

Question 11

A botanist observes that pollen from one species of plant cannot fertilize the ovules of another species due to pollen tube inhibition. This is an example of:

Accepted Answer

Gametic isolation

Question 12

Which of the following best describes the phylogenetic species concept?

Accepted Answer

The smallest group of individuals descended from a common ancestor and sharing derived traits.

Question 13

Two species of garter snakes live in the same geographic area, but one is aquatic and the other is terrestrial. Which type of reproductive isolation is this?

Accepted Answer

Habitat isolation

Question 14

Which of the following is a real-world example of behavioral isolation?

Accepted Answer

Western and Eastern Meadowlarks do not interbreed due to different songs.

Question 15

Which of the following statements about speciation is correct?

Accepted Answer

Speciation is the origin of new species and is a focal point of evolutionary theory.

Question 16

Which of the following is an example of reduced hybrid viability?

Accepted Answer

Hybrid zygotes fail to develop or reach sexual maturity, as seen in some frog species.

Question 17

Which of the following best distinguishes microevolution from macroevolution?

Accepted Answer

Microevolution involves changes in allele frequency within a population, while macroevolution involves speciation and broad evolutionary patterns.

Question 18

Which of the following is NOT a criterion for defining a species under the biological species concept?

Accepted Answer

Occupying the same habitat as other species.

Question 19

Which of the following is a consequence of postzygotic barriers?

Accepted Answer

Production of inviable or sterile hybrids.

Question 20

Which of the following best explains why two populations that are morphologically similar may still be considered different species under the biological species concept?

Accepted Answer

They are reproductively isolated and do not produce viable, fertile offspring together.

Speciation and the Biological Species Concept

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