Question 1

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

Accepted Answer

A change in the genetic composition of a population from generation to generation, leading to accumulated differences from ancestors.

Question 2

Which of the following is NOT a mechanism of evolution?

Accepted Answer

Homeostasis

Question 3

A population of insects is exposed to a new pesticide. After several generations, most of the population is resistant to the pesticide. Which evolutionary mechanism best explains this change?

Accepted Answer

Natural selection

Question 4

Which of the following conditions is required for a population to be in Hardy-Weinberg equilibrium?

Accepted Answer

No natural selection

Question 5

In a population of birds, a drought kills most plants that produce soft seeds, leaving only hard seeds. Over time, the average beak size in the population increases. What is the most likely explanation for this change?

Accepted Answer

Birds with larger beaks were more likely to survive and reproduce, passing on their genes.

Question 6

Which of the following best illustrates the bottleneck effect in evolution?

Accepted Answer

A sudden environmental change drastically reduces population size, leaving only a few survivors with limited genetic diversity.

Question 7

Which statement about natural selection is correct?

Accepted Answer

Natural selection acts on existing heritable variation within a population.

Question 8

A population of frogs is split by a new river, and over time, the two groups evolve independently. Which evolutionary mechanism is most directly involved in this scenario?

Accepted Answer

Genetic drift

Question 9

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 10

Why is genetic diversity important for the process of evolution?

Accepted Answer

It provides the raw material upon which natural selection can act.

Question 11

Which of the following is an example of sexual selection?

Accepted Answer

Females prefer to mate with males that have longer calls, leading to more offspring from those males.

Question 12

If a population is not evolving, which of the following must be true according to the Hardy-Weinberg principle?

Accepted Answer

There is no gene flow into or out of the population.

Question 13

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

Accepted Answer

Antibiotics select for bacteria that already have resistance genes, allowing them to survive and reproduce.

Question 14

Which of the following is a requirement for natural selection to occur in a population?

Accepted Answer

There must be heritable variation in traits.

Question 15

A population of birds migrates to a new island, and only a few individuals establish the new population. Which evolutionary mechanism is most likely to affect the genetic makeup of this new population?

Accepted Answer

Founder effect

Question 16

Which of the following statements about evolution is correct?

Accepted Answer

Evolution is a change in the genetic composition of a population over generations.

Question 17

Which of the following is an example of adaptation?

Accepted Answer

A population of insects develops resistance to a pesticide over several generations.

Question 18

Which of the following would violate the conditions necessary for Hardy-Weinberg equilibrium?

Accepted Answer

Individuals choose mates based on specific traits.

Question 19

Which of the following best describes genetic drift?

Accepted Answer

A change in allele frequencies due to random events, especially in small populations.

Question 20

Which of the following is a real-world example of the founder effect?

Accepted Answer

A few individuals from a mainland bird population colonize a remote island, resulting in a population with different allele frequencies than the original.

Evolution: Foundational Theories and Mechanisms in Biology

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