Q: In a population, the frequency of genotype SA is 0.18. What is the expected frequency of the SA genotype under Hardy-Weinberg equilibrium if $$p = 0.9$$ and $$q = 0.1$$?

$$2pq = 2 \times 0.9 \times 0.1 = 0.18$$

Question 1

Which of the following best describes the relationship between Darwin's theory of natural selection and Mendel's work on genetics?

Accepted Answer

Mendel's work provided the mechanism of inheritance that Darwin's theory of natural selection lacked, resulting in the synthesis of modern evolutionary ecology.

Question 2

A population of beetles has the following genotype frequencies: SS = 81%, SA = 18%, AA = 1%. What is the frequency of the S allele in this population?

Accepted Answer

$$p = 0.90$$

Question 3

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

Accepted Answer

Small population size

Question 4

In the Hardy-Weinberg equilibrium model, if $$p is $$the frequency of allele S and $$q is $$the frequency of allele A, which equation correctly represents the sum of allele frequencies?

Accepted Answer

$$p + q = 1$$

Question 5

Which of the following scenarios would most likely violate the conditions necessary for Hardy-Weinberg equilibrium?

Accepted Answer

A small, isolated population of birds on an island experiencing frequent immigration.

Question 6

What is the evolutionary significance of phenotypic plasticity in plant populations?

Accepted Answer

It enables plants to change trait expression in response to environmental conditions, increasing their chances of survival and reproduction.

Question 7

If a population is in Hardy-Weinberg equilibrium, what will happen to allele frequencies from one generation to the next?

Accepted Answer

Allele frequencies will remain constant.

Question 8

Which equation represents the expected genotype frequencies in a population with two alleles under Hardy-Weinberg equilibrium?

Accepted Answer

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

Question 9

A population of Harmonia beetles is observed to have multiple color pattern alleles. What does this observation suggest about the population?

Accepted Answer

There is genetic variation within the population, which can be studied using both morphological and molecular approaches.

Question 10

Which of the following best explains why small, isolated populations are least likely to meet Hardy-Weinberg equilibrium conditions?

Accepted Answer

Genetic drift and chance events have a greater impact, leading to changes in allele frequencies.

Question 11

In a population, the frequency of genotype SA is 0.18. What is the expected frequency of the SA genotype under Hardy-Weinberg equilibrium if $$p = 0.9$$ and $$q = 0.1$$?

Accepted Answer

$$2pq = 2 	imes 0.9 	imes 0.1 = 0.18$$

Question 12

Which of the following is an example of an ecotype?

Accepted Answer

A population of Potentilla glandulosa that is genetically adapted to high elevation environments.

Question 13

Why was Darwin unable to explain the mechanism of inheritance in his theory of natural selection?

Accepted Answer

The mechanisms of inheritance were unknown at the time.

Question 14

Which of the following would be considered a violation of Hardy-Weinberg equilibrium in a real-world population?

Accepted Answer

Individuals preferentially mating with those of similar genotype.

Question 15

What is the primary evolutionary process described by Darwin's theory of natural selection?

Accepted Answer

Differential survival and reproduction leading to adaptation.

Question 16

Which of the following best describes the concept of adaptation in evolutionary biology?

Accepted Answer

A process resulting in improved ability of a population to live in a particular environment.

Question 17

In a population with two alleles, S and A, if $$p = 0.7$$ and $$q = 0.3$$, what is the expected frequency of the AA genotype under Hardy-Weinberg equilibrium?

Accepted Answer

$$q^2 = 0.09$

Question 18

Which statement about alleles is correct according to Mendelian genetics?

Accepted Answer

Alleles exist in alternate forms and some can prevent the expression of others.

Question 19

A researcher conducts a common garden experiment with plants from different elevations. What is the main purpose of this experiment?

Accepted Answer

To determine if observed differences are due to genetic variation or environmental effects.

Question 20

Which of the following is a direct result of the synthesis of Darwin's theory of natural selection and Mendelian genetics?

Accepted Answer

The development of modern evolutionary ecology.

Population Genetics and Natural Selection: Foundations and the Hardy-Weinberg Principle

Study Guide - Practice Questions

Study Guide - Flashcards