Question 1

Which of the following best describes the process of natural selection as defined by Charles Darwin?

Accepted Answer

Organisms with inherited traits that increase survival and reproduction are more likely to pass on their genes to the next generation.

Question 2

A population of beetles is split by a river, and over thousands of years, the two groups evolve into separate species. This is an example of:

Accepted Answer

Allopatric speciation

Question 3

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

Accepted Answer

The human appendix

Question 4

The Hardy-Weinberg equation is used to:

Accepted Answer

Measure allele and genotype frequencies in a non-evolving population

Question 5

Which of the following is NOT a mechanism of evolution?

Accepted Answer

Mitosis

Question 6

A population of birds has a wide range of beak sizes. After a drought, only birds with very large or very small beaks survive, while those with medium-sized beaks die off. This is an example of:

Accepted Answer

Disruptive selection

Question 7

Which of the following best illustrates convergent evolution?

Accepted Answer

Wings of bats and wings of birds

Question 8

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

Accepted Answer

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

Question 9

Which of the following is a prezygotic barrier to reproduction?

Accepted Answer

Temporal isolation

Question 10

The Cambrian explosion is significant in the history of life on Earth because it marks:

Accepted Answer

A rapid diversification of animal body plans

Question 11

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

Accepted Answer

Soft-bodied organisms are less likely to fossilize

Question 12

Which event is associated with the end of the Cretaceous period?

Accepted Answer

The extinction of non-avian dinosaurs

Question 13

A small group of individuals colonizes a new island, and their descendants show reduced genetic variation compared to the original population. This is an example of:

Accepted Answer

Founder effect

Question 14

Which of the following is an example of artificial selection?

Accepted Answer

Breeding dogs for specific traits

Question 15

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Reduced hybrid fertility

Question 16

Which of the following best describes adaptive radiation?

Accepted Answer

The rapid evolution of many diverse species from a common ancestor

Question 17

Which of the following is an example of gene flow?

Accepted Answer

Migration of individuals between two populations, resulting in exchange of alleles

Question 18

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

Accepted Answer

It allows for the combination of alleles from two parents

Question 19

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

Accepted Answer

It cannot be applied to asexual organisms or fossils

Question 20

A researcher observes that two species of frogs live in the same pond but breed at different times of the year. This is an example of:

Accepted Answer

Temporal isolation

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

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