Question 1

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

Accepted Answer

Modern species are produced from ancestral species through gradual changes over time.

Question 2

Which of the following is NOT considered a line of evidence for evolution?

Accepted Answer

Astrology

Question 3

Relative dating of fossils relies on which principle?

Accepted Answer

The position of fossils within layers of rock, with deeper layers being older

Question 4

Radiometric dating uses the decay of radioactive isotopes to estimate the age of rocks. If the half-life of uranium-238 is $$4.5 	imes 10^9$ years, how much of the original uranium-238 remains after 9$$ 	imes $$10^9$$ years?

Accepted Answer

$$25\%$$

Question 5

Which scenario best illustrates biogeographical evidence for evolution?

Accepted Answer

Closely related species found on islands that resemble mainland ancestors, such as Hawaiian honeycreepers and finches

Question 6

What is the main difference between homologous and analogous structures?

Accepted Answer

Homologous structures share a common evolutionary origin, while analogous structures have similar functions but evolved independently.

Question 7

Which of the following best describes microevolution?

Accepted Answer

A change in allele or genotype frequencies within a population over a short period of time

Question 8

Why do populations, rather than individuals, evolve?

Accepted Answer

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

Question 9

Which evidence supports the idea that whales evolved from terrestrial ancestors?

Accepted Answer

Presence of vestigial hip and hindlimb bones in whale embryos

Question 10

If a population of tigers has an increase in the proportion of white-fur alleles over several generations, what has occurred?

Accepted Answer

Evolution, defined as a change in allele frequencies

Question 11

Which of the following is an example of convergent evolution?

Accepted Answer

Marsupial and placental mammals in Australia evolving similar body forms to fill similar ecological niches

Question 12

Which method would you use to determine the absolute age of a fossil?

Accepted Answer

Radiometric dating

Question 13

A scientist observes that molecular data, fossil records, and comparative anatomy all support the same evolutionary relationships among species. This is an example of:

Accepted Answer

Internal consistency

Question 14

Which of the following best explains why molecular clocks are useful in evolutionary biology?

Accepted Answer

They estimate the time since two species diverged based on DNA sequence differences.

Question 15

Which of the following is a vestigial structure?

Accepted Answer

The human appendix

Question 16

If two species have a large number of genetic differences, what does this suggest about their evolutionary relationship?

Accepted Answer

They have been evolving independently for a long time.

Question 17

Which laboratory experiment provides direct evidence for evolution?

Accepted Answer

Observing fruit fly populations developing new traits over multiple generations

Question 18

Which of the following best defines a species?

Accepted Answer

A group of organisms that can successfully interbreed with one another but not with members of other groups

Question 19

Which process results in one species splitting into two or more descendant species?

Accepted Answer

Speciation

Question 20

If the proportion of a particular allele in a population changes from $$0.2 to$$ $$0.5$$ over several generations, what has occurred?

Accepted Answer

Evolution, as defined by a change in allele frequencies

The Pattern of Evolution: Evidence and Mechanisms

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