Question 1

Which of the following best describes the difference between the reductionist approach and systems biology in studying biological organization?

Accepted Answer

Reductionist approach breaks down complex systems into simpler components for study, while systems biology emphasizes the interactions and emergent properties of the whole system.

Question 2

A population of beetles is isolated on an island. Over time, a random storm drastically reduces their numbers, leaving only a few survivors. Which evolutionary mechanism is most likely responsible for the change in allele frequencies in this scenario?

Accepted Answer

Genetic drift (bottleneck effect)

Question 3

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

Accepted Answer

Small population size

Question 4

According to Darwin's theory, which observation led to the inference that individuals with advantageous traits are more likely to survive and reproduce?

Accepted Answer

Members of a population often vary in their inherited traits.

Question 5

Which of the following best illustrates the concept of 'descent with modification'?

Accepted Answer

Modern species have evolved from ancestral species, accumulating changes over generations.

Question 6

A scientist observes that two different species of birds have similar beak shapes because they both eat the same type of seeds, but they are not closely related. This similarity is an example of:

Accepted Answer

Analogy (convergent evolution)

Question 7

Which equation represents the Hardy-Weinberg equilibrium for a gene with two alleles, $$p$$ and $$q$$?

Accepted Answer

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

Question 8

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

Accepted Answer

Two species breed at different times of the year.

Question 9

In a population, the frequency of allele $$A is$$ $$0.7$$ and allele $$a is$$ $$0.3. $$According to Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes ($$Aa$$)?

Accepted Answer

$$0.42$$

Question 10

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 11

Which process is most likely to introduce new alleles into a population?

Accepted Answer

Gene flow

Question 12

Which of the following is a real-world example of adaptive radiation?

Accepted Answer

The diversification of Darwin's finches on the Galápagos Islands into multiple species with different beak shapes.

Question 13

Which of the following statements about the fossil record is correct?

Accepted Answer

The fossil record favors species that were abundant, widespread, and had hard parts.

Question 14

Which of the following best explains why mass extinctions can lead to adaptive radiations?

Accepted Answer

Mass extinctions create new ecological opportunities by eliminating many species, allowing survivors to diversify.

Question 15

A researcher is constructing a phylogenetic tree using the principle of maximum parsimony. What is she trying to achieve?

Accepted Answer

To find the tree that requires the fewest evolutionary changes.

Question 16

Which of the following is an example of sympatric speciation?

Accepted Answer

A population of insects develops a new host plant preference within the same geographic area, leading to reproductive isolation.

Question 17

Which of the following is a source of genetic variation in a population?

Accepted Answer

Gene duplication

Question 18

If a hybrid zone forms between two species, what is a possible outcome for the species involved?

Accepted Answer

Reinforcement may occur, strengthening reproductive barriers.

Question 19

Which of the following best describes microevolution?

Accepted Answer

Changes in allele frequencies within a population over time.

Question 20

Which of the following is a correct statement about natural selection?

Accepted Answer

Natural selection acts on individuals, but only populations evolve.

Core Themes and Concepts in General Biology: Evolution, Speciation, and the Tree of Life

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