Question 1

Which of the following best describes allopatric speciation by vicariance?

Accepted Answer

A population splits into two due to a physical barrier, leading to genetic divergence.

Question 2

Which of the following is an example of prezygotic reproductive isolation?

Accepted Answer

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

Question 3

According to the biological species concept, what is the primary criterion for identifying species?

Accepted Answer

Ability to interbreed and produce viable, fertile offspring.

Question 4

A population of beetles is split by a new river, preventing gene flow. Over time, the two groups accumulate genetic differences. Which equation best represents the change in allele frequency due to genetic drift in one population?

Accepted Answer

$\Delta p = \frac{1}{2N}$

Question 5

Which scenario best illustrates sympatric speciation?

Accepted Answer

A population of fish in a lake splits into two species due to differences in diet, despite living in the same habitat.

Question 6

Which of the following is NOT a possible outcome of secondary contact between two previously isolated populations?

Accepted Answer

Immediate extinction of both populations.

Question 7

A researcher observes that two species of butterflies rarely mate because they are active at different times of day. What type of reproductive isolation is this?

Accepted Answer

Temporal isolation (prezygotic)

Question 8

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

Accepted Answer

Morphological species concept

Question 9

If two populations of mice are separated by a highway and cannot interbreed, but look identical, which species concept would fail to distinguish them as separate species?

Accepted Answer

Morphological species concept

Question 10

Which of the following best explains reinforcement in the context of speciation?

Accepted Answer

Natural selection increases reproductive isolation between populations after secondary contact.

Question 11

A population of plants undergoes polyploidy, resulting in instant reproductive isolation from the parent population. What type of speciation is this?

Accepted Answer

Sympatric speciation

Question 12

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

Accepted Answer

It cannot be applied to asexual organisms.

Question 13

Given the following scenario: Two populations of frogs are separated by a dam. After many generations, the dam is removed and the populations come into contact. If hybrids are less fit than either parent, what is the most likely outcome?

Accepted Answer

Reinforcement of reproductive barriers

Question 14

Which equation best describes the Hardy-Weinberg equilibrium for a gene with two alleles, $A$ and $a$, with frequencies $p$ and $q$?

Accepted Answer

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

Question 15

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

Accepted Answer

The formation of new species of snapping shrimp on either side of the Isthmus of Panama.

Question 16

Which of the following mechanisms is most likely to result in speciation in plants?

Accepted Answer

Polyploidy

Question 17

A scientist uses DNA sequence data to construct a phylogenetic tree and identify species. Which species concept is being applied?

Accepted Answer

Phylogenetic species concept

Question 18

Which of the following is an example of postzygotic isolation?

Accepted Answer

Hybrid offspring are sterile and cannot reproduce.

Question 19

Which of the following best describes the trade-off in identifying species using the morphological species concept?

Accepted Answer

It is useful for fossils but may group distinct species together if they look similar.

Question 20

Which of the following is a key insight from Bloom's taxonomy for studying speciation?

Accepted Answer

Higher-order thinking skills, such as analyzing and evaluating, are essential for understanding complex biological processes.

Speciation and Study Strategies: General Biology Study Guide

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