Question 1

Which of the following best distinguishes between the theory of evolution by natural selection and hypotheses about the origin of life?

Accepted Answer

The theory of evolution by natural selection describes the process by which species change over generations due to differential survival and reproduction, whereas origin of life hypotheses address how the first living organisms arose from non-living matter.

Question 2

Which of the following is NOT one of Darwin’s four postulates of evolution by natural selection?

Accepted Answer

All individuals survive and reproduce equally.

Question 3

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

Accepted Answer

Natural selection, because individuals with heritable resistance survived and reproduced more successfully.

Question 4

Which of the following scenarios best illustrates artificial selection?

Accepted Answer

Farmers breed only the largest and sweetest strawberries over many generations.

Question 5

Which of the following is an example of convergent evolution?

Accepted Answer

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

Question 6

Which line of evidence for evolution is best demonstrated by the similarity in the bone structure of a human arm, a whale flipper, and a bat wing?

Accepted Answer

Homology in anatomical structures.

Question 7

Which of the following best describes the difference between homology and analogy?

Accepted Answer

Homology refers to traits inherited from a common ancestor, while analogy refers to traits that evolved independently due to similar selective pressures.

Question 8

A scientist observes that two unrelated desert plants have thick, fleshy stems for water storage. This similarity is best explained by:

Accepted Answer

Convergent evolution, because similar environments led to similar adaptations.

Question 9

Which of the following is a correct interpretation of a phylogenetic tree?

Accepted Answer

Species that share a more recent common ancestor are more closely related.

Question 10

Which of the following best explains how random heritable mutations contribute to evolution by natural selection?

Accepted Answer

They introduce genetic variation, some of which may provide a survival or reproductive advantage under certain environmental conditions.

Question 11

A population of bacteria is exposed to an antibiotic. After several generations, most bacteria are resistant. Which of the following best describes the genetic mechanism behind this evolution?

Accepted Answer

Resistant bacteria had heritable mutations that allowed them to survive and reproduce, increasing the frequency of resistance alleles.

Question 12

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

Accepted Answer

The presence of identical traits in all living organisms.

Question 13

Which of the following best describes the concept of fitness in evolutionary biology?

Accepted Answer

The ability of an individual to survive and reproduce in its environment.

Question 14

Which of the following statements about evolution and natural selection is correct?

Accepted Answer

Natural selection is one mechanism that can cause evolution, which is defined as a change in allele frequencies in a population over time.

Question 15

Which of the following best explains how the breakup of Pangea influenced the evolution of species?

Accepted Answer

It separated populations, leading to divergent evolution and the formation of new species due to geographic isolation.

Question 16

Which of the following is an example of a hypothesis, as opposed to a scientific theory?

Accepted Answer

If a population of beetles is exposed to a new predator, then the frequency of green beetles will decrease.

Question 17

Which of the following best describes the process of adaptation?

Accepted Answer

A heritable trait that increases an organism’s fitness in a particular environment becomes more common in the population over generations.

Question 18

A researcher observes that two species of African elephants are genetically distinct from Asian elephants. Which of the following is the most plausible explanation for this observation?

Accepted Answer

Geographic isolation led to genetic divergence and speciation between the African and Asian elephant populations.

Question 19

Which of the following best describes how biogeography supports the theory of evolution by natural selection?

Accepted Answer

Closely related species are often found in the same geographic region, suggesting they evolved from a common ancestor.

Question 20

Which of the following is an example of using data to support the theory of evolution by natural selection?

Accepted Answer

Measuring changes in beak size in Galapagos finches over several years in response to drought.

Ch. 19: Descent with Modification – The Theory of Evolution by Natural Selection

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