Question 1

Which of the following best describes the Biological Species Concept?

Accepted Answer

A group of organisms that can interbreed and produce fertile offspring, but do not produce fertile offspring with members of other such groups.

Question 2

Which of the following is an example of a prezygotic barrier to reproduction?

Accepted Answer

Temporal isolation

Question 3

A population of frogs is separated by a newly formed river, preventing them from mating. Over time, the two populations evolve independently. What type of speciation is this an example of?

Accepted Answer

Allopatric speciation

Question 4

Which of the following scenarios best illustrates habitat isolation as a prezygotic barrier?

Accepted Answer

Two species of garter snakes, one living in water and the other on land, do not encounter each other to mate.

Question 5

Which of the following is a likely outcome if hybrids in a hybrid zone are less fit than either parent species?

Accepted Answer

Reinforcement of reproductive barriers

Question 6

Polyploidy is a common mechanism of speciation in plants. Which of the following best describes polyploidy?

Accepted Answer

A failure of chromosomes to separate during meiosis, resulting in extra sets of chromosomes.

Question 7

Which of the following equations best represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

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

Question 8

A botanist discovers a plant population in which some individuals have twice the normal number of chromosomes. These individuals can only breed with each other, not with the original population. What type of speciation is most likely occurring?

Accepted Answer

Sympatric speciation via polyploidy

Question 9

Which of the following best explains why hybrid breakdown is considered a postzygotic barrier?

Accepted Answer

It results in hybrid offspring that are fertile but whose descendants are weak or sterile.

Question 10

Which of the following is an example of temporal isolation?

Accepted Answer

Two species of flowers release pollen at different times of the year.

Question 11

A hybrid zone forms between two closely related species of butterflies. Over time, the hybrid zone remains stable and hybrids continue to be produced. Which outcome does this scenario best represent?

Accepted Answer

Stability

Question 12

Which of the following statements about adaptive radiation is correct?

Accepted Answer

It occurs when a single ancestral species rapidly diversifies into many new species to fill different ecological niches.

Question 13

Which of the following best distinguishes microevolution from macroevolution?

Accepted Answer

Microevolution refers to changes within a species, while macroevolution refers to evolution at or above the species level.

Question 14

Which of the following is an example of mechanical isolation as a prezygotic barrier?

Accepted Answer

Two species of insects have differently shaped reproductive organs that prevent successful mating.

Question 15

In the context of speciation, what is reinforcement?

Accepted Answer

The strengthening of reproductive barriers due to selection against less fit hybrids.

Question 16

Which of the following best describes punctuated equilibrium?

Accepted Answer

Long periods of stasis interrupted by brief periods of rapid evolutionary change.

Question 17

A scientist observes that two populations of birds have different mating songs and do not interbreed, even though they live in the same area. What type of reproductive barrier is this?

Accepted Answer

Behavioral isolation

Question 18

Which of the following is most likely to lead to sympatric speciation in animals?

Accepted Answer

Sexual selection based on mate choice

Question 19

Which of the following is NOT a postzygotic barrier?

Accepted Answer

Gametic isolation

Question 20

A population of insects splits into two groups, one of which feeds on a new type of plant introduced to the area. Over time, the two groups become reproductively isolated. What is the most likely mechanism of speciation in this scenario?

Accepted Answer

Sympatric speciation due to habitat differentiation

Chapter 22: The Origin of Species – From Speciation to Macroevolution

Guida di studio - Domande di pratica

Study guide - Flashcard