Question 1

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

Accepted Answer

Species accumulate differences from their ancestors as they adapt to different environments, leading to both shared features and new variations.

Question 2

A population of insects is exposed to a new pesticide. After several generations, most individuals are resistant to the pesticide. Which mechanism best explains this evolutionary change?

Accepted Answer

Natural selection favored insects with pre-existing resistance genes, increasing their frequency in the population.

Question 3

Which of the following is an example of convergent evolution?

Accepted Answer

The similar streamlined body shapes of dolphins (mammals) and sharks (fish) due to adaptation to aquatic environments.

Question 4

Which statement about homology is correct?

Accepted Answer

Homology describes similarities in traits or structures among different species due to shared ancestry.

Question 5

Why did Darwin consider the Linnaean classification system useful for evolutionary biology?

Accepted Answer

It grouped organisms based on their evolutionary relationships, often matching their kinship.

Question 6

A scientist finds a fossil of an extinct mammal in the Andes. Based on evolutionary theory, which present-day mammals would you expect it to most closely resemble?

Accepted Answer

Mammals from South American jungles, due to shared ancestry and geographic proximity.

Question 7

Which of the following best illustrates the process of artificial selection?

Accepted Answer

Humans breeding wild mustard to produce crops like broccoli, cabbage, and kale.

Question 8

Which of the following statements about natural selection is FALSE?

Accepted Answer

Natural selection creates new traits needed for survival.

Question 9

In an experiment, guppies from a high-predation pool (drab coloration) are moved to a pool with only juvenile predators. After 15 generations, the transplanted guppies have more colored spots and greater total area of coloration. What does this result demonstrate?

Accepted Answer

Predation pressure can drive rapid evolutionary changes in observable traits.

Question 10

Which of the following is a vestigial structure?

Accepted Answer

The pelvic bones in modern whales, which no longer serve their ancestral function.

Question 11

Why is Cuvier’s explanation of the fossil record not considered scientific?

Accepted Answer

It attributed changes to sudden catastrophes without proposing mechanisms that could be observed or tested.

Question 12

Which evidence supports the close evolutionary relationship between cetaceans (whales, dolphins) and even-toed ungulates (hippos, pigs)?

Accepted Answer

Fossil records show intermediate forms with ankle bones (astragalus) unique to both groups, and DNA sequence data confirm their close relationship.

Question 13

Which of the following best explains why the genetic code is considered evidence for the unity of life?

Accepted Answer

All organisms use the same DNA sequence to encode the same amino acids, indicating descent from a common ancestor.

Question 14

A population of soapberry bugs in Florida shifts from feeding on balloon vine (deep seeds) to golden rain tree (shallow seeds). Over several decades, the average beak length decreases. What does this scenario illustrate?

Accepted Answer

Natural selection can cause rapid evolutionary changes in response to environmental shifts.

Question 15

Which of the following is a prediction based on biogeography and continental drift?

Accepted Answer

Fossils of the genus Equus (horses) older than 5 million years should only be found in North America.

Question 16

Which of the following statements about scientific theories is TRUE?

Accepted Answer

A scientific theory is a comprehensive explanation supported by extensive evidence and is continually tested and refined.

Question 17

If the frequency of a white-flower allele in a pea population is $$p$$, and white-flowered plants are favored by natural selection, what would you expect to happen to $$p$$ over time?

Accepted Answer

$$p$$ will increase as individuals with the white-flower allele are more likely to survive and reproduce.

Question 18

Which of the following best distinguishes between homologous and analogous structures?

Accepted Answer

Homologous structures arise from common ancestry, while analogous structures result from convergent evolution.

Question 19

Which of the following is an example of a testable scientific hypothesis related to evolution?

Accepted Answer

If guppies are moved to a low-predation environment, their coloration will become brighter over generations.

Question 20

Why does natural selection not always lead to 'perfect' organisms?

Accepted Answer

Environments change over time, and traits that are advantageous in one context may be neutral or harmful in another.

Descent with Modification: The Darwinian View of Life (Chapter 22 Study Notes)

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