Question 1

Which of the following statements 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

What is the primary difference between typological thinking and population thinking in evolutionary biology?

Accepted Answer

Typological thinking assumes species are fixed and unchanging, while population thinking emphasizes variation among individuals.

Question 3

Which evidence supports the claim that species have changed over time?

Accepted Answer

The presence of vestigial traits in modern organisms.

Question 4

Radiometric dating is used to determine the absolute age of rocks. Which formula represents the relationship used in radiometric dating?

Accepted Answer

$$N_t = N_0$ e$$^{-\lambda t}$$

Question 5

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

Accepted Answer

The wings of ostriches, which cannot be used for flight.

Question 6

A population of bacteria is exposed to an antibiotic. After several generations, most bacteria are resistant. Which Darwinian postulate does this scenario best illustrate?

Accepted Answer

Variation in reproductive success among individuals.

Question 7

Which of the following is NOT a misconception about natural selection?

Accepted Answer

Natural selection acts on individuals, but only populations evolve.

Question 8

Which level of homology is demonstrated when chick, human, and cat embryos all have pharyngeal pouches?

Accepted Answer

Developmental homology

Question 9

Why are silent mutations generally not acted upon by natural selection?

Accepted Answer

They do not change the phenotype of the organism.

Question 10

Which of the following best describes a fitness trade-off?

Accepted Answer

A compromise between traits, such as egg size and number of offspring produced.

Question 11

Which process is responsible for the formation of new species from preexisting species?

Accepted Answer

Speciation

Question 12

Which of the following is NOT a component of Darwin's four postulates?

Accepted Answer

All individuals in a population have identical traits.

Question 13

Which of the following is a real-world example of evolution observed in contemporary populations?

Accepted Answer

Evolution of antibiotic resistance in bacteria.

Question 14

Which statement about natural selection is correct?

Accepted Answer

Natural selection sorts existing variants; it does not create new traits in individuals.

Question 15

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

Accepted Answer

Pleiotropy, where a single allele affects multiple traits.

Question 16

Which evidence supports the idea that whales and hippos share a common ancestor?

Accepted Answer

Similarities and differences in DNA sequences.

Question 17

Which of the following is NOT a process that causes evolution, according to modern biology?

Accepted Answer

Acclimatization

Question 18

During a drought, finches with deeper beaks survived better and reproduced more. What does this scenario illustrate?

Accepted Answer

Natural selection acting on heritable variation.

Question 19

Which formula would you use to calculate the frequency of a dominant allele in a population, given Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 20

Which of the following best explains why not all traits are adaptive?

Accepted Answer

Some traits, such as vestigial traits and silent mutations, confer no known benefit.

Chapter 22: Evolution by Natural Selection – Study Notes

Study Guide - Practice Questions

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