Question 1

Which of the following best describes 'descent with modification' as presented in evolutionary biology?

Accepted Answer

Species accumulate differences from their ancestors as they adapt to different environments over time.

Question 2

In the context of natural selection, which scenario best illustrates the concept of 'fitness'?

Accepted Answer

A plant that produces more seeds which survive to adulthood in its environment.

Question 3

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

Accepted Answer

Small population size.

Question 4

Given a population where the frequency of allele $$A is$$ $$p = 0.7$$ and the frequency of allele $$a is$$ $$q = 0.3$$, what is the expected frequency of heterozygotes ($$Aa) $$under Hardy-Weinberg equilibrium?

Accepted Answer

$$0.42$$

Question 5

Which real-world example best demonstrates the process of natural selection?

Accepted Answer

The increase in antibiotic-resistant bacteria in hospitals over time.

Question 6

Which equation represents the Hardy-Weinberg principle for genotype frequencies?

Accepted Answer

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

Question 7

A population of 1000 plants has two alleles, $$C^R$$ and $$C^W. If$$ $$p = 0.8$$ for $$C^R$$ and $$q = 0.2$$ for $$C^W$$, what is the expected number of $$C^R C^W$$ heterozygotes in the next generation under Hardy-Weinberg equilibrium?

Accepted Answer

320

Question 8

Which evolutionary mechanism is most likely responsible for the increased frequency of hereditary blindness on a remote island colonized by a small group of settlers?

Accepted Answer

Genetic drift (founder effect)

Question 9

Why is genetic drift more significant in small populations than in large populations?

Accepted Answer

Chance events can cause larger changes in allele frequencies in small populations.

Question 10

Which of the following is a consequence of a population bottleneck?

Accepted Answer

Random loss of alleles, potentially fixing harmful alleles.

Question 11

If a population is in Hardy-Weinberg equilibrium, what will happen to allele and genotype frequencies over generations?

Accepted Answer

They will remain constant from generation to generation.

Question 12

Which of the following best explains why antibiotic resistance in bacteria is an example of natural selection?

Accepted Answer

Resistant bacteria survive and reproduce more successfully in the presence of antibiotics.

Question 13

A population of birds has two alleles for beak shape: $$B$$ and $$b. If$$ $$p = 0.6$$ and $$q = 0.4$$, what is the expected frequency of homozygous recessive ($$bb) $$individuals?

Accepted Answer

$$0.24$$

Question 14

Which of the following scenarios would violate the assumptions of Hardy-Weinberg equilibrium?

Accepted Answer

A population experiencing a high rate of mutation.

Question 15

Which process can introduce new alleles into a population, increasing genetic variation?

Accepted Answer

Gene flow

Question 16

If the frequency of allele $$A in a $$population is $$0.5$$, what is the expected frequency of genotype $$AA$$ under Hardy-Weinberg equilibrium?

Accepted Answer

$$0.25$$

Question 17

Which of the following is an example of adaptation resulting from natural selection?

Accepted Answer

Finches on the Galápagos Islands developing different beak shapes suited to their diets.

Question 18

Which statement about genetic drift is correct?

Accepted Answer

It can cause harmful alleles to become fixed in a population.

Question 19

A population of prairie chickens experienced a severe reduction in numbers due to habitat loss. What evolutionary effect is most likely to occur?

Accepted Answer

Genetic bottleneck leading to reduced genetic variation.

Question 20

Which of the following best describes the founder effect?

Accepted Answer

A small group starts a new population, and allele frequencies differ from the original population due to chance.

Evolution of Populations: Mechanisms and Genetic Equilibrium

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