Question 1

Which of the following best describes the biological species concept?

Accepted Answer

A group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring.

Question 2

Which of the following is an example of a pre-zygotic reproductive isolating mechanism?

Accepted Answer

Mating occurs at different times of the year for two populations.

Question 3

A population of frogs is separated by the construction of a new highway, preventing gene flow between the two groups. Over time, the two populations diverge genetically and can no longer interbreed. This is an example of:

Accepted Answer

Allopatric speciation

Question 4

Which species concept would be most useful for identifying fossil species?

Accepted Answer

Morphological species concept

Question 5

Which of the following best illustrates the difference between microevolution and macroevolution?

Accepted Answer

Microevolution refers to changes in allele frequencies within a population, while macroevolution refers to the origin of new species and higher taxonomic groups.

Question 6

A plant species undergoes a genetic mutation that doubles its chromosome number, resulting in a new species that cannot interbreed with the original population. This is an example of:

Accepted Answer

Polyploid speciation

Question 7

Which of the following scenarios is an example of sympatric speciation?

Accepted Answer

A population of insects develops a preference for a new host plant within the same geographic area, leading to reproductive isolation.

Question 8

Which of the following is a post-zygotic barrier to reproduction?

Accepted Answer

Hybrid sterility

Question 9

According to the punctuated equilibrium model, evolutionary change:

Accepted Answer

Occurs in rapid bursts followed by long periods of stasis.

Question 10

Which of the following best describes the ecological species concept?

Accepted Answer

Species are defined by their unique adaptations to particular roles in a biological community.

Question 11

A botanist discovers two populations of wildflowers that look nearly identical but occupy different habitats and do not interbreed. Which species concept would best help the botanist determine if these are separate species?

Accepted Answer

Ecological species concept

Question 12

Which of the following is NOT a requirement for allopatric speciation to occur?

Accepted Answer

Polyploidy

Question 13

A hybrid zone forms between two closely related bird species. Over time, hybrids have lower fitness than either parent species. What is the most likely long-term outcome?

Accepted Answer

Reinforcement of reproductive barriers

Question 14

Which of the following is an example of a phylogenetic species concept application?

Accepted Answer

Defining species as the smallest group of individuals sharing a common ancestor, forming one branch on the tree of life

Question 15

Which of the following equations best represents the Hardy-Weinberg equilibrium, which is used to study microevolution?

Accepted Answer

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

Question 16

Which of the following scenarios would most likely lead to adaptive radiation?

Accepted Answer

A single ancestral species colonizes a new, diverse environment with many available niches.

Question 17

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

Accepted Answer

The divergence of squirrel species on opposite sides of the Grand Canyon.

Question 18

Which of the following statements about reproductive isolating mechanisms is correct?

Accepted Answer

Pre-zygotic barriers prevent fertilization from occurring.

Question 19

A population of insects is split by a volcanic eruption, and over thousands of years, the two groups evolve into distinct species. Which evolutionary model does this best support?

Accepted Answer

Punctuated equilibrium

Question 20

Which of the following best explains why hybrid polyploid speciation is more common in plants than in animals?

Accepted Answer

Plants can often self-fertilize and tolerate changes in chromosome number, while animals usually cannot.

Chapter 14: The Origin of Species – Study Guide and Key Concepts

Study Guide - Practice Questions

Study Guide - Flashcards