Question 1

Which scientist first proposed the idea that species can change over time, and what was the main mechanism he suggested for this change?

Accepted Answer

Lamarck; inheritance of acquired characteristics

Question 2

During Darwin's voyage on the HMS Beagle, he observed finches on the Galápagos Islands. What was the most significant insight he gained from these observations?

Accepted Answer

Different beak shapes were adaptations to specific food sources, supporting the idea of natural selection.

Question 3

Which of the following best describes the process of natural selection as illustrated by the antibiotic resistance in bacteria?

Accepted Answer

Individuals with genetic resistance survive and reproduce, increasing the frequency of resistance in the population.

Question 4

Given the data on DDT resistance in mosquitoes, calculate the rate of increase in resistance from month 0 to month 12. Use the formula $	ext{Rate} = \frac{	ext{Final} - 	ext{Initial}}{	ext{Time}}$.

Accepted Answer

$\frac{77\% - 4\%}{12} = 6.08\%$ per month

Question 5

The peppered moths in England changed color during the Industrial Revolution. What evolutionary mechanism explains this change?

Accepted Answer

Natural selection favored moths with coloration that matched the environment, increasing their survival.

Question 6

In the experiment with Asian shore crabs and blue mussels, what adaptation was observed in southern mussels exposed to green crabs?

Accepted Answer

Southern mussels developed thicker shells as a defense against predation.

Question 7

Which scenario best illustrates the concept of convergent evolution?

Accepted Answer

Sugar glider and flying squirrel both evolved gliding adaptations independently in Australia and North America.

Question 8

Which anatomical structure is considered homologous among vertebrates, and what does this imply about their evolutionary history?

Accepted Answer

Forelimbs (e.g., human arm, whale flipper, bat wing); they share a common ancestor.

Question 9

Which evidence supports the theory of evolution based on molecular biology?

Accepted Answer

The universal genetic code and ubiquitous proteins like cytochrome C.

Question 10

A population of crickets is exposed to a new parasite that targets noisy males. Over several generations, most males develop silent wings. Which evolutionary process is most likely responsible for this change?

Accepted Answer

Natural selection favoring silent males due to increased survival.

Question 11

Which of the following is NOT a requirement for natural selection to occur?

Accepted Answer

All individuals must have identical traits.

Question 12

What is the significance of vestigial organs in the context of evolution?

Accepted Answer

They are remnants of structures that were functional in ancestral species, providing evidence for descent with modification.

Question 13

Which dating method would be most appropriate for determining the age of a fossilized mammoth preserved in frozen soil?

Accepted Answer

Carbon-14 dating

Question 14

The evolutionary tree of whales shows a transition from land-dwelling ancestors to fully aquatic forms. Which anatomical change is most significant in this transition?

Accepted Answer

Transformation of legs into flippers and reduction of pelvic bones.

Question 15

Which scenario best demonstrates artificial selection?

Accepted Answer

Humans breeding dogs for specific traits over generations.

Question 16

Which of the following is an example of a fossilized cast?

Accepted Answer

A natural mold formed after decomposition, later filled with minerals.

Question 17

Why are evolutionary trees considered hypotheses?

Accepted Answer

They are based on available data and can change with new evidence.

Question 18

Which of the following best explains why polar bears are found in the Arctic but not the Antarctic, while penguins are found in the Antarctic but not the Arctic?

Accepted Answer

Biogeographical distribution due to historical evolutionary events and continental separation.

Question 19

Which of the following is a direct observation of evolution in action?

Accepted Answer

Increase in DDT-resistant mosquitoes over time.

Ch.22 Descent with Modification: A Darwinian View of Life

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