Question 1

Which of the following best describes a vestigial trait?

Accepted Answer

A trait that has lost its original function but is still present in an organism due to descent from a common ancestor.

Question 2

Which mechanism of evolution is directly responsible for the development of antibiotic resistance in bacteria, as seen in tuberculosis?

Accepted Answer

Natural selection

Question 3

What is the primary evidence that supports the idea that species have changed over time?

Accepted Answer

The fossil record showing extinction and transitional forms

Question 4

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

Accepted Answer

All individuals must survive and reproduce equally

Question 5

A population of finches on the Galápagos Islands experienced a drought, resulting in a shift in average beak depth. What does this scenario best illustrate?

Accepted Answer

Natural selection acting on heritable variation

Question 6

Which statement about homology is correct?

Accepted Answer

Homology is the similarity between organisms due to descent from a common ancestor.

Question 7

Which of the following equations best represents the concept of fitness in evolutionary biology?

Accepted Answer

$$Fitness = \frac{Number\ of\ offspring\ produced}{Total\ number\ of\ individuals}$$

Question 8

Which of the following is an example of convergent evolution?

Accepted Answer

The streamlined body shapes of dolphins and ichthyosaurs

Question 9

Why is evolution not considered a progressive process?

Accepted Answer

Because evolution produces a tree of life, not a ladder of life

Question 10

Which of the following best distinguishes acclimatization from adaptation?

Accepted Answer

Adaptation is a population-level genetic change, while acclimatization is an individual-level physiological response.

Question 11

Which of the following is NOT a mechanism of evolution?

Accepted Answer

Acclimatization

Question 12

What is the significance of transitional forms in the fossil record?

Accepted Answer

They provide evidence for gradual evolutionary change between major groups.

Question 13

Which of the following is a genetic constraint that can limit adaptation?

Accepted Answer

Genetic correlation between traits

Question 14

Why do not all traits in an organism necessarily increase fitness?

Accepted Answer

Because genetic constraints, tradeoffs, and historic constraints can prevent optimal adaptation

Question 15

Which of the following best explains why individuals do not evolve?

Accepted Answer

Individuals can only acclimatize, not change their genetic makeup in response to selection.

Question 16

Which of the following is an example of a structural homology?

Accepted Answer

The similar arrangement of bones in the forelimbs of turtles, humans, and seals

Question 17

Which of the following statements about natural selection is FALSE?

Accepted Answer

Natural selection is a goal-directed process that produces perfect organisms.

Question 18

In the experiment with Galápagos finches, what was the null hypothesis?

Accepted Answer

No changes in beak characteristics occurred in response to a drought.

Question 19

Which of the following best describes gene flow?

Accepted Answer

The movement of alleles between populations due to migration

Question 20

Which of the following is a common misconception about evolution?

Accepted Answer

Individuals evolve in response to selection.

Lecture 1: Evolution

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