Q: A population of beetles has two alleles for shell color: green (G) and brown (g). If the frequency of G is 0.7 and g is 0.3, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the process of microevolution?

Accepted Answer

The change in allele frequencies within a population over generations.

Question 2

A population of beetles has two alleles for shell color: green (G) and brown (g). If the frequency of G is 0.7 and g is 0.3, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 3

Which of the following is an example of a density-dependent factor affecting population growth?

Accepted Answer

A disease spreading more rapidly as population size increases.

Question 4

Which mechanism of evolution is most likely to increase genetic variation within a population?

Accepted Answer

Gene flow

Question 5

A researcher observes that two closely related bird species live in the same forest but breed at different times of the year. What type of reproductive isolation is this?

Accepted Answer

Temporal isolation

Question 6

Which of the following equations correctly represents the logistic growth model for population size $$N$$ over time $$t$$?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 7

Which of the following scenarios best illustrates natural selection?

Accepted Answer

A drought favors birds with larger beaks, leading to an increase in their frequency in the next generation.

Question 8

Which of the following best explains why genetic drift has a greater effect in small populations?

Accepted Answer

Random changes in allele frequencies are more likely to lead to fixation or loss of alleles.

Question 9

Which of the following is NOT a requirement for a population to be in Hardy-Weinberg equilibrium?

Accepted Answer

Natural selection favoring the fittest genotype

Question 10

A population of rabbits is introduced to an island with no predators. Over several generations, the population grows rapidly and then levels off. Which ecological concept does this illustrate?

Accepted Answer

Carrying capacity

Question 11

Which of the following best describes the founder effect?

Accepted Answer

A small group of individuals establishes a new population with a different allele frequency than the original population.

Question 12

Which of the following is an example of macroevolution?

Accepted Answer

The evolution of mammals from reptile-like ancestors.

Question 13

Which of the following is a real-world example of gene flow?

Accepted Answer

Wolves from one pack migrate and breed with wolves from another pack.

Question 14

Which of the following best describes the competitive exclusion principle?

Accepted Answer

Two species competing for the same limiting resource cannot coexist at constant population values.

Question 15

Which of the following is an example of a real-world application of evolutionary theory in medicine?

Accepted Answer

The development of antibiotic resistance in bacteria due to overuse of antibiotics.

Question 16

Which of the following equations represents the Hardy-Weinberg equation for genotype frequencies?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 17

Which of the following is a likely outcome of disruptive selection?

Accepted Answer

Both extreme phenotypes become more common than the intermediate phenotype.

Question 18

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

Accepted Answer

Mutations are the ultimate source of genetic variation.

Question 19

Which of the following is an example of a real-world ecological interaction?

Accepted Answer

A lion hunting a zebra in the savanna.

Question 20

Which of the following best explains why invasive species often outcompete native species in a new environment?

Accepted Answer

Invasive species often lack natural predators or competitors in the new environment.

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