Question 1

Which of the following best describes the main contribution of Darwin and Wallace to evolutionary biology, in contrast to earlier ideas about species change?

Accepted Answer

They independently proposed that natural selection is the mechanism by which species evolve over time from common ancestors.

Question 2

Which of the following is NOT a line of evidence supporting the theory of evolution?

Accepted Answer

Spontaneous generation

Question 3

A scientist observes that whales have pelvic bones, even though they do not have hind limbs. These bones are best described as:

Accepted Answer

Vestigial structures

Question 4

Which of the following scenarios best illustrates convergent evolution?

Accepted Answer

Wings of bats and wings of birds, which evolved independently for flight

Question 5

Which of the following is a requirement for a population to remain in Hardy-Weinberg equilibrium?

Accepted Answer

All of the above

Question 6

In a population of 1000 individuals, the frequency of allele A is $$p = 0.7$$ and allele a is $$q = 0.3. $$According to Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes (Aa)?

$$	ext{Frequency of Aa} = 2pq$$

Accepted Answer

$$0.42$$

Question 7

Which pattern of natural selection favors individuals at both extremes of a trait, potentially leading to two distinct phenotypes?

Accepted Answer

Disruptive selection

Question 8

Which of the following best describes genetic drift?

Accepted Answer

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

Question 9

Which of the following is a postzygotic barrier to reproduction?

Accepted Answer

Hybrid sterility

Question 10

A botanist discovers a new plant species that arose when a diploid plant underwent genome duplication, resulting in a tetraploid offspring that can only mate with other tetraploids. This is an example of:

Accepted Answer

Sympatric speciation via polyploidy

Question 11

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

Accepted Answer

It is biased toward organisms with hard parts and those that lived in aquatic environments.

Question 12

Which of the following is the best definition of a monophyletic group?

Accepted Answer

A group that includes an ancestor and all of its descendants

Question 13

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

Accepted Answer

It cannot be applied to asexual organisms.

Question 14

Which event is most likely to lead to adaptive radiation?

Accepted Answer

A population colonizes a new environment with many available niches.

Question 15

Which of the following best explains why variation in populations is necessary for natural selection?

Accepted Answer

Variation allows some individuals to survive and reproduce more successfully than others.

Question 16

Which of the following is the correct order of appearance on Earth, from earliest to most recent?

Accepted Answer

Prokaryotes, eukaryotes, multicellular eukaryotes, animals, land plants, humans

Question 17

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 18

Which of the following best describes the principle of parsimony when constructing phylogenetic trees?

Accepted Answer

The tree that requires the fewest evolutionary changes is preferred.

Question 19

Which of the following is an example of a neutral mutation?

Accepted Answer

A mutation that does not affect the fitness of an organism

Question 20

A fossil is found in a rock layer containing an isotope with a half-life of 10 million years. If only 25% of the original isotope remains, how old is the fossil?

$$	ext{Number of half-lives} = \log_2$\left(\frac{1}{0.25}ight) = 2$$

$$	ext{Age} = 2 	imes 10\ 	ext{million years} = 20\ 	ext{million years}$$

Accepted Answer

$$20$$ million years

Guided Study for College Biology: Evolution, Speciation, and Phylogenetics

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