Q: In a population, the frequency of allele A is 0.7 and allele a is 0.3. What is the expected frequency of heterozygotes (Aa) 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 natural selection as it relates to the diversification of viruses, microorganisms, and multicellular organisms?

Accepted Answer

Natural selection acts on existing variation, favoring traits that enhance survival and reproduction in a given environment.

Question 2

A population of bacteria is exposed to an antibiotic. Over several generations, most bacteria die, but a few survive and reproduce. Which evolutionary concept does this scenario best illustrate?

Accepted Answer

Natural selection

Question 3

Which equation is used to estimate allele frequencies in a population under Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 4

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

Accepted Answer

Increased genetic similarity between populations

Question 5

A researcher uses a phylogenetic tree to compare genetic relationships among species. What does each branch point (node) on the tree represent?

Accepted Answer

A speciation event where a common ancestor splits into two lineages

Question 6

Which of the following best explains why kinship and reciprocity can shape the evolution of cooperative behavior in animals?

Accepted Answer

Kinship increases the likelihood of cooperation because individuals share genes, and reciprocity allows for mutual benefit over time.

Question 7

Which of the following is NOT an assumption of the Hardy-Weinberg equilibrium?

Accepted Answer

Small population size

Question 8

A population of moths has two color morphs: light and dark. After a pollution event, the frequency of the dark morph increases. Which evolutionary mechanism is most likely responsible?

Accepted Answer

Natural selection

Question 9

Which of the following best describes the use of molecular clocks in evolutionary biology?

Accepted Answer

They measure the rate of mutation in a population to estimate the time since two species diverged.

Question 10

Which formula would you use to calculate the expected genotype frequencies for a population with two alleles, A and a, where $$p is $$the frequency of A and $$q is $$the frequency of a?

Accepted Answer

$$p^2$$ for AA, $$2pq$$ for Aa, $$q^2$$ for aa

Question 11

Which scenario best illustrates the concept of genetic drift?

Accepted Answer

A small population of birds is isolated on an island, and by chance, only a few individuals reproduce, changing allele frequencies.

Question 12

Which of the following is a real-world application of evolutionary principles in biomedicine?

Accepted Answer

Using evolutionary analysis to track the spread and mutation of viruses such as influenza.

Question 13

In a population, the frequency of allele A is 0.7 and allele a is 0.3. What is the expected frequency of heterozygotes (Aa) under Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 14

Which of the following best describes sexual selection?

Accepted Answer

Selection for traits that increase an individual's ability to attract mates, even if those traits reduce survival.

Question 15

Which evolutionary concept is illustrated by the following scenario: A population of fish is split by a dam, and over time, the two groups evolve into distinct species?

Accepted Answer

Allopatric speciation

Question 16

Which of the following is a critical insight from comparative methods in evolutionary biology?

Accepted Answer

Comparative methods allow scientists to identify patterns of genetic, organismal, and cultural evolution across different species.

Question 17

Which of the following is an example of a molecular process used to analyze evolutionary change?

Accepted Answer

Sequencing DNA to compare genetic differences between populations.

Question 18

Which of the following best explains why evolutionary game theory is useful in understanding animal behavior?

Accepted Answer

It models how individuals make decisions based on the strategies of others, predicting stable patterns of behavior.

Question 19

Which of the following is a correct application of the Chi-square ($$\$$chi^2$$) test in evolutionary biology?

Accepted Answer

Testing whether observed genotype frequencies deviate from expected frequencies under Hardy-Weinberg equilibrium.

Question 20

Which of the following is a difference between mutation and gene flow as mechanisms of evolutionary change?

Accepted Answer

Mutation introduces new alleles into a population, while gene flow moves alleles between populations.

General Biology: Evolutionary Biology Syllabus and Course Structure

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