Question 1

Which of the following best describes the biological species concept?

Accepted Answer

A species is a group of organisms that can interbreed and produce fertile offspring in nature.

Question 2

Two populations of frogs live in the same pond but breed at different times of the year. What type of reproductive isolation is this?

Accepted Answer

Temporal isolation

Question 3

A river forms and splits a population of squirrels into two groups. Over time, these groups diverge genetically and can no longer interbreed. This is an example of:

Accepted Answer

Allopatric speciation

Question 4

Which of the following is an example of postmating isolating mechanisms?

Accepted Answer

Hybrid infertility

Question 5

A liger is the offspring of a male lion and a female tiger. Ligers are usually sterile. Which isolating mechanism does this illustrate?

Accepted Answer

Hybrid infertility

Question 6

Which scenario best illustrates ecological isolation?

Accepted Answer

Two species of birds live in the same forest but feed in different parts of the trees.

Question 7

Which of the following is a likely outcome of adaptive radiation?

Accepted Answer

A single species gives rise to many new species adapted to different environments.

Question 8

If two species of coral release their gametes at different times of night, what type of isolation is this?

Accepted Answer

Temporal isolation

Question 9

Which of the following best explains why members of different species may look similar but are reproductively isolated?

Accepted Answer

They have convergent evolution but different mating behaviors or times.

Question 10

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

Accepted Answer

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

Question 11

A population of insects splits into two groups, one feeding on apple trees and the other on hawthorn trees. Over time, they become reproductively isolated. This is an example of:

Accepted Answer

Sympatric speciation

Question 12

Which of the following is NOT a pre-mating isolating mechanism?

Accepted Answer

Hybrid inviability

Question 13

Why does extreme specialization put a species at risk of extinction?

Accepted Answer

Specialized species depend on specific resources, so if those resources disappear, the species may go extinct.

Question 14

Which of the following best describes the process of allopatric speciation?

Accepted Answer

A population is divided by a physical barrier, and the separated groups evolve independently.

Question 15

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

Accepted Answer

Two frog species have different mating calls and do not interbreed.

Question 16

If a hybrid offspring is produced but fails to survive to reproductive age, which isolating mechanism is at work?

Accepted Answer

Hybrid inviability

Question 17

Which of the following best explains the pattern seen in adaptive radiation?

Accepted Answer

A single ancestral species rapidly diversifies into many new species, each adapted to a different environment.

Question 18

Deforestation in the Amazon is a threat to biodiversity because:

Accepted Answer

It destroys habitats, leading to species extinction.

Question 19

Which of the following is an example of mechanical incompatibility?

Accepted Answer

Two insect species have differently shaped reproductive organs that prevent mating.

Question 20

Which of the following is a likely consequence of reduced genetic diversity in a population?

Accepted Answer

Greater risk of extinction due to inability to adapt.

The Origin of Species: Mechanisms and Patterns of Speciation

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