Question 1

Which of the following best describes the concept of 'descent with modification' as proposed by Charles Darwin?

Accepted Answer

The process by which species accumulate differences from their ancestors as they adapt to different environments over time.

Question 2

A farmer breeds only the largest and fastest-growing corn plants each season. This is an example of which evolutionary process?

Accepted Answer

Artificial selection

Question 3

Which of the following is a direct observation of evolutionary change in response to environmental pressures?

Accepted Answer

The development of antibiotic resistance in bacteria within a hospital over several years

Question 4

Which statement correctly distinguishes between homologous and analogous structures?

Accepted Answer

Homologous structures are similar due to shared ancestry, while analogous structures are similar due to convergent evolution.

Question 5

Which of the following best describes a monophyletic group (clade) in a phylogenetic tree?

Accepted Answer

A group that includes a common ancestor and all of its descendants.

Question 6

A researcher is constructing a phylogenetic tree and chooses the simplest tree that explains all observed traits. Which principle is she applying?

Accepted Answer

Maximum parsimony

Question 7

Which of the following scenarios best illustrates the founder effect?

Accepted Answer

A few individuals from a mainland population colonize a new island, resulting in a gene pool that differs from the original population.

Question 8

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

Accepted Answer

$$2pq = 0.42$$

Question 9

Sickle-cell anemia persists in some human populations because heterozygotes are resistant to malaria. This is an example of:

Accepted Answer

Heterozygote advantage and balancing selection

Question 10

Which of the following is NOT a reason why natural selection cannot produce 'perfect' organisms?

Accepted Answer

Natural selection always increases genetic variation.

Question 11

Which reproductive barrier is described by the inability of sperm from one species to fertilize the eggs of another species?

Accepted Answer

Gametic isolation (a prezygotic barrier)

Question 12

Which species concept defines a species based on its ecological niche?

Accepted Answer

Ecological species concept

Question 13

A population of frogs is split by the formation of a new river, and over time, the two groups evolve into separate species. This is an example of:

Accepted Answer

Allopatric speciation

Question 14

Which pattern in the fossil record is best explained by the model of punctuated equilibria?

Accepted Answer

Long periods of little change interrupted by brief periods of rapid speciation

Question 15

Radiometric dating is based on which scientific principle?

Accepted Answer

The decay of radioactive isotopes at a constant rate

Question 16

Which event is most likely to trigger adaptive radiation?

Accepted Answer

A mass extinction that opens up new ecological niches

Question 17

Which of the following is NOT a characteristic that has enabled prokaryotes to thrive in diverse environments?

Accepted Answer

Complex multicellular structures

Question 18

Which process is described by the engulfment of a photosynthetic eukaryote by a heterotrophic eukaryote, leading to the origin of some protist groups?

Accepted Answer

Secondary endosymbiosis

Question 19

Which of the following best explains why mitochondria and chloroplasts are considered evidence for the endosymbiont theory?

Accepted Answer

They contain their own circular DNA and divide independently of the cell.

Question 20

Which ecological role is performed by both prokaryotes and single-celled eukaryotes, and is essential for nutrient cycling in ecosystems?

Accepted Answer

Decomposer

Evolutionary Processes, Phylogeny, and the Early History of Life: Study Guide

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