Question 1

Which of the following best describes the Hardy-Weinberg equilibrium?

Accepted Answer

A population in which allele frequencies remain constant from generation to generation in the absence of evolutionary forces.

Question 2

A population of 1000 pine trees contains 600 trees with genotype AA, 300 with Aa, and 100 with aa. What is the frequency of the 'a' allele in this population? Use the formula $$q = \frac{2N_{aa} + N_{Aa}}{2N_{total}}.$$

Accepted Answer

$$q = 0.25$$

Question 3

Which of the following is an example of allopatric speciation?

Accepted Answer

A population of birds is split by the formation of a mountain range, leading to reproductive isolation.

Question 4

Which of the following statements about genetic drift is correct?

Accepted Answer

Genetic drift can lead to the loss of alleles in small populations.

Question 5

A scientist observes that two species of frogs in South America have overlapping ranges but do not interbreed due to differences in mating calls. This is an example of:

Accepted Answer

Behavioral isolation

Question 6

Which of the following is NOT a condition required for Hardy-Weinberg equilibrium?

Accepted Answer

Natural selection

Question 7

Which evolutionary force is most likely to increase genetic variation in a population?

Accepted Answer

Gene flow

Question 8

A population of beetles is separated by a river, and over time, the two groups evolve into distinct species. This is an example of:

Accepted Answer

Allopatric speciation

Question 9

Which of the following best explains why sickle cell anemia is more common in regions where malaria is prevalent?

Accepted Answer

Heterozygote advantage

Question 10

Which of the following is an example of convergent evolution?

Accepted Answer

Wings in bats and birds

Question 11

A population of lizards is found on two separate islands. Over time, the lizards on each island develop different coloration due to different environmental pressures. What type of selection is this?

Accepted Answer

Directional selection

Question 12

Which of the following is the best definition of a species according to the biological species concept?

Accepted Answer

A group of organisms that can interbreed and produce fertile offspring.

Question 13

Which of the following is a postzygotic reproductive barrier?

Accepted Answer

Hybrid sterility

Question 14

Which of the following equations is used to calculate allele frequencies in a population?

Accepted Answer

$$p + q = 1$$

Question 15

A population of mice is exposed to a new predator. Over several generations, the average fur color shifts from light to dark. This is an example of:

Accepted Answer

Directional selection

Question 16

Which of the following is NOT a mechanism of reproductive isolation?

Accepted Answer

Gene flow

Question 17

Which of the following is an example of a founder effect?

Accepted Answer

A small group of birds colonizes a new island and develops unique traits.

Question 18

Which of the following is most likely to result in sympatric speciation?

Accepted Answer

Polyploidy in plants

Question 19

Which of the following is a prezygotic barrier to reproduction?

Accepted Answer

Temporal isolation

Question 20

Which of the following best describes adaptive radiation?

Accepted Answer

The rapid evolution of many diverse species from a common ancestor.

Evolution and Speciation: Study Guide for General Biology

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