Question 1

Which of the following best describes Darwin's two main observations that led to his theory of natural selection?

Accepted Answer

Members of a population vary in their inherited traits, and individuals with traits best suited to their environment tend to leave more offspring.

Question 2

A population of beetles has two color morphs: green and brown. After a forest fire, the frequency of the brown allele increases dramatically because most green beetles were killed. Which evolutionary mechanism does this scenario best illustrate?

Accepted Answer

Genetic drift (Bottleneck Effect)

Question 3

Which of the following is an example of a vestigial structure in humans?

Accepted Answer

The human appendix

Question 4

Which equation is used to calculate allele frequencies in a population under Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 5

Which of the following best explains why sexual reproduction increases genetic variation in a population?

Accepted Answer

It combines alleles from two parents, creating new combinations of traits.

Question 6

A population of birds lives on two islands separated by a wide river. Over time, the populations diverge and can no longer interbreed even if brought together. What type of speciation has occurred?

Accepted Answer

Allopatric speciation

Question 7

Which of the following is NOT a prezygotic barrier to reproduction?

Accepted Answer

Reduced hybrid fertility

Question 8

Which event is most closely associated with the 'oxygen revolution' in Earth's history?

Accepted Answer

The appearance of photosynthetic prokaryotes

Question 9

Which of the following best describes convergent evolution?

Accepted Answer

Two unrelated species develop similar traits due to similar environmental pressures.

Question 10

Which of the following is a limitation of the biological species concept?

Accepted Answer

It cannot be applied to asexual organisms.

Question 11

Which mass extinction event is associated with the extinction of the dinosaurs?

Accepted Answer

Cretaceous Mass Extinction

Question 12

A population of fish in a lake is suddenly split into two by a landslide, creating two isolated ponds. Over thousands of years, the two groups evolve into separate species. Which evolutionary process is this an example of?

Accepted Answer

Allopatric speciation

Question 13

Which of the following is an example of directional selection?

Accepted Answer

A population of moths becomes darker in color after industrial pollution darkens tree bark.

Question 14

Which of the following best explains why the fossil record is incomplete?

Accepted Answer

Many organisms did not fossilize because they had soft bodies or lived in environments not conducive to fossilization.

Question 15

Which of the following is an example of gene flow?

Accepted Answer

A bird from one population migrates to another population and breeds, introducing new alleles.

Question 16

Which of the following is a postzygotic barrier?

Accepted Answer

Reduced hybrid fertility

Question 17

Which of the following best describes adaptive radiation?

Accepted Answer

A single ancestral species rapidly diversifies into many new species adapted to different environments.

Question 18

Which of the following is an example of artificial selection?

Accepted Answer

Humans breeding dogs for specific traits such as size or coat color.

Question 19

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

Accepted Answer

Species change over time, giving rise to new species while sharing a common ancestor.

Question 20

Which of the following is a direct observation supporting evolution?

Accepted Answer

The rapid evolution of antibiotic resistance in MRSA bacteria.

BIO 101 Final Exam Study Guide: Evolution, Speciation, and the History of Life

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