Question 1

Which of the following best describes the process of speciation?

Accepted Answer

The process by which one species splits into two or more distinct species.

Question 2

According to the biological species concept, which of the following is required for two organisms to be considered the same species?

Accepted Answer

They must be able to interbreed in nature and produce viable, fertile offspring.

Question 3

Which of the following is NOT a prezygotic barrier to reproduction?

Accepted Answer

Reduced hybrid fertility

Question 4

A population of frogs is split by a newly formed river, preventing them from interbreeding. Over time, genetic drift and natural selection cause the two groups to diverge genetically. What type of speciation is this?

Accepted Answer

Allopatric speciation

Question 5

Which equation best represents the concept of gene flow between populations?

Accepted Answer

$$p' = (1 - m)p + m p_m$$

Question 6

Which of the following scenarios is an example of behavioral isolation?

Accepted Answer

Two species of insects have different courtship rituals and do not recognize each other as mates.

Question 7

A mule is the offspring of a horse and a donkey. Mules are generally sterile. Which postzygotic barrier does this illustrate?

Accepted Answer

Reduced hybrid fertility

Question 8

Which of the following is a limitation of the biological species concept?

Accepted Answer

It cannot be applied to asexual organisms or fossils.

Question 9

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

Accepted Answer

Plants

Question 10

Which of the following best describes a hybrid zone?

Accepted Answer

A region where members of different species mate and produce hybrids.

Question 11

If hybrids in a hybrid zone have lower fitness than parent species, what is the likely evolutionary outcome?

Accepted Answer

Reinforcement of reproductive barriers

Question 12

Which species concept relies on structural features and can be applied to both sexual and asexual organisms?

Accepted Answer

Morphological species concept

Question 13

A plant species undergoes a chromosomal duplication event, resulting in offspring with double the number of chromosomes. This is an example of:

Accepted Answer

Polyploidy

Question 14

Which of the following is an example of temporal isolation?

Accepted Answer

Two species of frogs breed at different times of the year.

Question 15

Which of the following equations could be used to model the change in allele frequency due to gene flow?

Accepted Answer

$$p' = (1 - m)p + m p_m$$

Question 16

Which of the following is NOT a possible outcome for a hybrid zone over time?

Accepted Answer

Extinction of both parent species

Question 17

Which pattern of speciation is characterized by long periods of stasis punctuated by rapid change?

Accepted Answer

Punctuated equilibrium

Question 18

Which of the following is an example of mechanical isolation?

Accepted Answer

Two species of insects cannot mate because their reproductive organs do not fit together.

Question 19

Which of the following best explains why gene flow sometimes occurs between distinct species, challenging the biological species concept?

Accepted Answer

Hybrid zones allow for interbreeding and exchange of alleles.

Question 20

Which of the following is a real-world example of how a single gene mutation can influence speciation?

Accepted Answer

A mutation in monkeyflowers changes pollinator preference, leading to reproductive isolation.

Speciation and the Origin of Species (Chapter 22 Study Notes)

Study Guide - Practice Questions

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