Q: A population of beetles has two alleles for shell 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 heterozygotes under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the concept of 'descent with modification' as proposed by Charles Darwin?

Accepted Answer

All living species are connected by common ancestry, and descendants accumulate adaptations to changing environments over time.

Question 2

Which of the following is an example of a vestigial structure in humans, and what does its presence indicate?

Accepted Answer

The coccyx (tailbone); it is a remnant of a structure that served a function in our ancestors.

Question 3

A population of beetles has two alleles for shell 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 heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 4

Which of the following scenarios best illustrates the founder effect?

Accepted Answer

A small group of lizards colonizes a new island, and their descendants show different allele frequencies compared to the original population.

Question 5

Which of the following is NOT an assumption of the Hardy-Weinberg equilibrium?

Accepted Answer

Natural selection is acting on the population.

Question 6

A scientist observes that two species of frogs live in the same pond but breed at different times of the year. What type of reproductive barrier is this?

Accepted Answer

Temporal isolation

Question 7

Which of the following best explains why antibiotic resistance in bacteria is a growing public health concern?

Accepted Answer

The overuse and misuse of antibiotics select for bacteria with resistance genes, allowing them to survive and multiply.

Question 8

Which of the following is an example of adaptive radiation?

Accepted Answer

A single species of finch colonizes an island chain and evolves into multiple species, each adapted to different food sources.

Question 9

Which of the following statements about natural selection is FALSE?

Accepted Answer

Natural selection always produces perfectly adapted organisms.

Question 10

A population of flowers has red (R) and white (r) alleles. If $$p = 0.8$$ and $$q = 0.2$$, what is the expected frequency of homozygous recessive individuals under Hardy-Weinberg equilibrium?

Accepted Answer

$$q^2 = 0.04$

Question 11

Which of the following best describes the difference between allopatric and sympatric speciation?

Accepted Answer

Allopatric speciation involves geographic isolation, whereas sympatric speciation occurs within the same geographic area.

Question 12

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

Accepted Answer

Hybrid offspring of two species of horses and donkeys (mules) are sterile.

Question 13

Which of the following best explains why the fossil record is considered strong evidence for evolution?

Accepted Answer

It documents the historical sequence in which organisms have evolved and reveals transitional forms.

Question 14

Which of the following is a correct application of the molecular clock concept?

Accepted Answer

Estimating the time since two species diverged by comparing the number of genetic differences in a specific gene.

Question 15

Which of the following is an example of convergent evolution?

Accepted Answer

Wings of bats and wings of birds, which evolved independently in different lineages.

Question 16

Which of the following best describes the process of artificial selection?

Accepted Answer

Humans selectively breed organisms with desirable traits, leading to significant changes over generations.

Question 17

Which of the following is a shared derived character for mammals?

Accepted Answer

Hair

Question 18

Which of the following is a real-world example of balancing selection?

Accepted Answer

The maintenance of both normal and sickle-cell alleles in regions where malaria is common.

Question 19

Which of the following best explains why evolution is not goal-directed?

Accepted Answer

Evolution is limited by historical constraints, acts only on existing variation, and is influenced by chance and changing environments.

Question 20

Which of the following events is most closely associated with the formation of the supercontinent Pangaea?

Accepted Answer

The merging of all major landmasses about 250 million years ago, affecting the distribution and diversification of organisms.

Evolutionary Biology: How Populations Evolve, Speciation, and Tracing Evolutionary History

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