Question 1

Which of the following best describes the concept of 'descent with modification' as used in evolutionary theory?

Accepted Answer

Populations change over generations, inheriting traits from ancestors, sometimes retaining features that no longer serve their original purpose.

Question 2

Which scientist developed the principle of Uniformitarianism, arguing that the Earth is shaped by gradual, ongoing processes over vast timescales?

Accepted Answer

Charles Lyell

Question 3

A population of insects is exposed to a new pesticide. After several generations, most insects are resistant. According to Darwin’s first postulate, why did resistance arise?

Accepted Answer

Random mutations created variation, and some individuals happened to possess resistance before the pesticide was applied.

Question 4

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

Accepted Answer

The wings of flightless ostriches

Question 5

Why did the theory of blended inheritance pose a problem for Darwin’s mechanism of natural selection?

Accepted Answer

It predicted that extreme phenotypes would disappear, eliminating the variation needed for natural selection.

Question 6

Which of the following best illustrates the concept of analogous structures?

Accepted Answer

The wings of a bird and the wings of an insect, which serve similar functions but have different evolutionary origins.

Question 7

In the case of the Silent Crickets of Kauai, which Darwinian postulate was directly affected by the arrival of the parasitic fly?

Accepted Answer

Postulate 4: Survival and reproduction are not determined by chance; reproductive success depends on specific traits.

Question 8

Which of the following is a critical insight provided by molecular biology in support of evolutionary theory?

Accepted Answer

All organisms use DNA, RNA, and the same 20 amino acids, indicating a shared evolutionary origin.

Question 9

Which equation represents the expected genotype frequencies in a Mendelian cross between two heterozygous individuals ($$Aa 	imes Aa$$)?

Accepted Answer

$$1AA : 2Aa : 1aa$$

Question 10

Which of the following is NOT a postulate of Darwin and Wallace’s theory of natural selection?

Accepted Answer

All individuals survive and reproduce equally.

Question 11

Artificial selection in dog breeding demonstrates which Darwinian postulate?

Accepted Answer

Traits are passed from parent to offspring (Postulate 2).

Question 12

Which scientist proposed the (now refuted) theory of inheritance of acquired characteristics?

Accepted Answer

Jean-Baptiste Lamarck

Question 13

Which of the following is an example of convergent evolution?

Accepted Answer

The development of similar streamlined bodies in dolphins (mammals) and sharks (fish) for efficient swimming.

Question 14

Which of the following best explains why extreme phenotypes (AA or aa) reappear in Mendelian genetics, but not in blended inheritance?

Accepted Answer

Alleles remain discrete and segregate independently, allowing for the reappearance of parental phenotypes.

Question 15

Which of the following is a real-world example of natural selection acting on a population?

Accepted Answer

Silent crickets in Kauai surviving and reproducing more successfully after the arrival of a parasitic fly.

Question 16

Which anatomical evidence supports the idea of common ancestry among vertebrates?

Accepted Answer

Homologous structures, such as the similar bone arrangement in the forelimbs of humans, cats, and birds.

Question 17

Which scientist is credited with recognizing that specific fossils are consistently found in the same layers of rock, indicating a progression of forms?

Accepted Answer

William Smith

Question 18

Which of the following best describes the role of competition in Darwin’s third postulate?

Accepted Answer

Limited resources create competition, so only some individuals survive long enough to reproduce.

Question 19

Which equation best represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

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

Question 20

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

Accepted Answer

All species are genetically identical and do not change over time.

Principles of Evolution: Study Guide and Key Concepts

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