Question 1

Which of the following best describes the difference between homologous and analogous structures?

Accepted Answer

Homologous structures share a common ancestry but may have different functions, while analogous structures have similar functions but evolved independently.

Question 2

In a population of 100 individuals, you observe 75 blue beads (F allele) and 25 orange beads (f allele). What is the frequency of the f allele in this population?

Accepted Answer

$$f = \frac{25}{100} = 0.25$$

Question 3

Which of the following scenarios best illustrates genetic drift?

Accepted Answer

A hurricane wipes out most of a small island population, leaving only a few survivors whose allele frequencies differ from the original population.

Question 4

Which condition is NOT required for a population to be in Hardy-Weinberg equilibrium?

Accepted Answer

There is random mating within the population.

Question 5

A population of whooping cranes was reduced to 16 individuals due to a natural disaster. Which evolutionary mechanism is most likely to have a significant effect on this population?

Accepted Answer

Genetic drift

Question 6

If two heterozygous individuals (Ff) mate, what is the probability that their child will be affected by a recessive genetic disorder (ff)?

Accepted Answer

$$P(ff) = \frac{1}{4}$$

Question 7

Which of the following is an example of convergent evolution?

Accepted Answer

The wings of bats and the wings of insects, which serve similar functions but evolved independently.

Question 8

Which of the following statements about allele frequencies is correct?

Accepted Answer

If the frequency of one allele increases, the frequency of another allele must decrease so that the total remains 100%.

Question 9

Which of the following is NOT a mechanism of evolution?

Accepted Answer

Random mating in a large population

Question 10

A population of moths changes color from light to dark over several generations due to increased pollution. This is an example of:

Accepted Answer

Natural selection

Question 11

Which of the following best explains why the frequency of a recessive allele (f) might not decrease over time, even if it causes a harmful phenotype when homozygous?

Accepted Answer

The allele can be carried by heterozygotes (Ff) who do not express the harmful phenotype.

Question 12

Which of the following is a direct consequence of gene flow between two populations?

Accepted Answer

The two populations become more genetically similar over time.

Question 13

Which of the following is an example of sexual selection?

Accepted Answer

Male peacocks with larger, more colorful tails are more likely to attract mates.

Question 14

Which of the following is NOT evidence for evolution?

Accepted Answer

The random assortment of alleles during meiosis

Question 15

Which of the following best describes a population bottleneck?

Accepted Answer

A sharp reduction in population size due to a random event, leading to a loss of genetic diversity.

Question 16

Which of the following would violate the assumptions of Hardy-Weinberg equilibrium?

Accepted Answer

Individuals preferentially mate with close relatives.

Question 17

Gregor Mendel's experiments with pea plants demonstrated which of the following principles?

Accepted Answer

Traits are inherited independently of each other in dominant and recessive patterns.

Question 18

Which of the following best describes macroevolution?

Accepted Answer

Processes that give rise to new species and taxonomic groups with widely divergent characteristics.

Question 19

A scientist finds that the bones in the forelimbs of whales, bats, and humans have the same overall construction. This is evidence for:

Accepted Answer

Homology, indicating a common ancestor.

Question 20

If a population is in Hardy-Weinberg equilibrium and the frequency of the dominant allele (F) is $$0.6$$, what is the expected frequency of heterozygotes (Ff)?

Accepted Answer

$$2pq = 2 	imes 0.6 	imes 0.4 = 0.48$$

Mechanisms of Evolution: Step-by-Step Study Guidance

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