Question 1

Which of the following best describes the Hardy-Weinberg equilibrium?

Accepted Answer

A state in which allele and genotype frequencies remain constant from generation to generation in a population, provided that certain conditions are met.

Question 2

Given the Hardy-Weinberg equation $$p^2 + 2pq$$ + $$q^2 = 1$, what does 2pq$ represent?

Accepted Answer

The frequency of heterozygous individuals in the population.

Question 3

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

Accepted Answer

Non-random mating

Question 4

A population of beetles has two alleles for color: G (green) and g (brown). If the frequency of G is $$p = 0.7$$ and the frequency of g is $$q = 0.3$$, what is the expected frequency of brown homozygotes ($$gg) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$q^2 = 0.09$

Question 5

Which of the following is an example of a postzygotic reproductive barrier?

Accepted Answer

Reduced hybrid fertility

Question 6

Which evolutionary mechanism is most likely responsible for a sudden reduction in genetic diversity due to a natural disaster?

Accepted Answer

Bottleneck effect

Question 7

Which type of selection favors individuals at both extremes of a phenotypic range?

Accepted Answer

Disruptive selection

Question 8

Which of the following best explains why vestigial structures are important evidence for evolution?

Accepted Answer

They are remnants of structures that had important functions in ancestors, indicating descent with modification.

Question 9

A population of finches colonizes a new island and rapidly diversifies into several species, each adapted to a different food source. This is an example of:

Accepted Answer

Adaptive radiation

Question 10

Which of the following scenarios best illustrates gene flow?

Accepted Answer

Members of two neighboring populations interbreed, resulting in the exchange of alleles.

Question 11

Which statement about homologous structures is correct?

Accepted Answer

They are similar due to shared ancestry, even if their functions differ.

Question 12

Which of the following is a prezygotic barrier that prevents mating between two species?

Accepted Answer

Behavioral isolation

Question 13

In a population, the frequency of allele A is $$p = 0.4$$ and allele a is $$q = 0.6. $$What is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 0.48$$

Question 14

Which of the following best describes the biological species concept?

Accepted Answer

A species is a group of populations whose members can interbreed and produce viable, fertile offspring.

Question 15

Which process is most likely to result in sympatric speciation?

Accepted Answer

Polyploidy in plants

Question 16

Which of the following is an example of convergent evolution?

Accepted Answer

Wings of bats and wings of insects

Question 17

What does the branch length in a phylogenetic tree typically represent?

Accepted Answer

The amount of evolutionary change or time since divergence

Question 18

Which of the following is a consequence of mass extinction?

Accepted Answer

Adaptive radiation of surviving species into newly available niches

Question 19

Why is distinguishing between homology and analogy important in phylogenetic analysis?

Accepted Answer

Because only homologous traits reflect shared ancestry and are useful for reconstructing evolutionary relationships.

Question 20

Which of the following best describes the founder effect?

Accepted Answer

A small group of individuals establishes a new population, leading to reduced genetic diversity.

Evolution, Population Genetics, Speciation, and Phylogenetics: Study Guide

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