Question 1

Which of the following best describes Darwin's concept of 'descent with modification'?

Accepted Answer

Modern species have evolved from ancestral species through gradual changes over time.

Question 2

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

Accepted Answer

All individuals in a population survive and reproduce equally.

Question 3

A population of bacteria is exposed to an antibiotic. After treatment, only a few bacteria survive and reproduce. Which Darwinian postulate does this scenario best illustrate?

Accepted Answer

Survival and reproductive success are highly variable.

Question 4

Which of the following statements about Lamarck’s theory of evolution is correct?

Accepted Answer

It proposed that acquired traits during an organism’s lifetime could be inherited by offspring.

Question 5

Why did August Weismann’s experiment with mice disprove Lamarckian inheritance?

Accepted Answer

Offspring of tailless mice still had normal tails, showing acquired traits are not inherited.

Question 6

Which of the following best defines evolutionary fitness?

Accepted Answer

The ability of an individual to produce surviving, fertile offspring relative to others in the population.

Question 7

A population of cave fish loses its eyesight over generations. According to Darwinian evolution, what is the most likely explanation?

Accepted Answer

Individuals with mutations for reduced eyesight had higher fitness in the cave environment.

Question 8

Which of the following is an example of acclimatization rather than adaptation?

Accepted Answer

A Californian moving to Michigan and gradually becoming less sensitive to cold.

Question 9

Which of the following statements about evolution is FALSE?

Accepted Answer

All traits in organisms are adaptive and increase fitness.

Question 10

Which of the following is an example of a fitness trade-off?

Accepted Answer

A bird species evolving a larger beak to eat larger seeds, but losing the ability to eat small seeds efficiently.

Question 11

Which of the following best explains why silent mutations are not acted on by natural selection?

Accepted Answer

They do not change the amino acid sequence of proteins and thus do not affect phenotype.

Question 12

A population of finches on the Galapagos Islands evolves larger beaks over generations. According to Darwin, what is the most likely explanation?

Accepted Answer

Finches with naturally larger beaks were more likely to survive and reproduce in an environment with large seeds.

Question 13

Which of the following is NOT a mechanism of evolution?

Accepted Answer

Acclimatization

Question 14

Why do only populations, and not individuals, evolve?

Accepted Answer

Evolution is defined as a change in allele frequencies within a population over time.

Question 15

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

Accepted Answer

The pelvic bone in whales.

Question 16

A person claims that antibiotics caused a mutation in Mycobacterium tuberculosis, making it resistant. What is the correct evolutionary explanation?

Accepted Answer

Mutations conferring resistance already existed in the population, and antibiotics selected for those individuals.

Question 17

Which of the following best describes a genetic constraint on evolution?

Accepted Answer

Lack of genetic variation limits the traits that can evolve in a population.

Question 18

Which of the following is an example of a historical constraint on evolution?

Accepted Answer

A bird’s wing evolving from a structure originally used for walking.

Question 19

Which of the following statements about adaptation is TRUE?

Accepted Answer

Adaptation occurs when allele frequencies in a population change due to natural selection.

Question 20

Which of the following best summarizes Theodosius Dobzhansky’s famous statement: 'Nothing in Biology Makes Sense Except in the Light of Evolution'?

Accepted Answer

Evolution provides the unifying framework for understanding all biological phenomena.

Evolution by Natural Selection: Mechanisms, Evidence, and Misconceptions

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