Q: If the frequency of allele A in a population is $$p = 0.4$$, what is the expected frequency of the heterozygous genotype under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.4 \times 0.6 = 0.48$$

Question 1

Which of the following best describes the role of mutation in evolution?

Accepted Answer

Mutation provides genetic variation, which is necessary for natural selection to act.

Question 2

In the Hardy-Weinberg equilibrium, which of the following conditions must be met for allele frequencies to remain constant?

Accepted Answer

No migration, random mating, no mutation, large population size, and no selection.

Question 3

A population of American chestnut trees was wiped out by blight because it lacked a blight-resistant allele. What does this scenario illustrate about genetic variation?

Accepted Answer

Genetic variation allows populations to respond to environmental changes.

Question 4

Which equation correctly calculates the frequency of the dominant phenotype in a population under Hardy-Weinberg equilibrium?

Accepted Answer

$$p^2 + 2pq$

Question 5

In a replica plating experiment, colonies that appear on both low and high antibiotic plates most likely indicate:

Accepted Answer

Pre-existing variation for antibiotic resistance in the population.

Question 6

Genetic drift is most likely to have a significant effect in which scenario?

Accepted Answer

A small population where alleles can be lost by random chance.

Question 7

In the study cycle diagram, which step involves actively testing your understanding by teaching or explaining concepts?

Accepted Answer

CHECK

Question 8

The leucistic American alligator shown in the image is an example of:

Accepted Answer

A mutation resulting in a loss of pigmentation.

Question 9

Which of the following best explains why less genetic variation in a population is a concern for future survival?

Accepted Answer

It reduces the population's ability to adapt to environmental changes.

Question 10

In the wild mustard diagram, the different vegetables (kale, cabbage, broccoli, etc.) are examples of:

Accepted Answer

Artificial selection for different plant traits.

Question 11

If the frequency of allele A in a population is $$p = 0.4$$, what is the expected frequency of the heterozygous genotype under Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 12

A student models evolution using the AMP program and observes that allele frequency remains constant over generations. What does this indicate?

Accepted Answer

The population is in genetic equilibrium (no evolution).

Question 13

In a population genetics experiment, increasing the fitness of a recessive allele from 0.8 to 0.95 would most likely result in:

Accepted Answer

An increase in the frequency of the recessive allele over generations.

Question 14

Which of the following is a correct hypothesis for a replica plating experiment testing antibiotic resistance?

Accepted Answer

Exposure to antibiotics will change the fitness (reproduction) of the population.

Question 15

If a population of 100 individuals has 10% of a plate covered by colonies, what is the percentage coverage?

Accepted Answer

$$\frac{10}{100} 	imes 100 = 10\%$$

Question 16

Which of the following best describes the effect of small changes in fitness on allele frequency over time?

Accepted Answer

Small changes in fitness can have large effects on allele frequency over many generations.

Question 17

In the Morphs simulation, increasing the mutation rate generally results in:

Accepted Answer

Faster appearance of new phenotypes.

Question 18

Which of the following is NOT a requirement for proper scientific graph formatting in a biology lab report?

Accepted Answer

Describing trends and data in the figure caption.

Question 19

Which of the following is a plausible reason for differences in generations required to reach a phenotype in repeated mutation rate experiments?

Accepted Answer

Random chance and variation in mutation events.

Question 20

Which of the following statements about fitness is correct?

Accepted Answer

Fitness is a measure of an individual's reproductive success in a given environment.

Modeling Evolution and Natural Selection: Study Guide for BIOL 1209

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