Q: Refer to the Hardy-Weinberg equations shown in the third image. If $$p = 0.7$$ and $$q = 0.3$$, what is the expected frequency of heterozygotes in the population?

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

Question 1

Which of the following best describes the Linnaean system of classification?

Accepted Answer

It assigns each species a two-part name consisting of the genus and a unique species identifier.

Question 2

According to Darwin's theory, what is the primary mechanism driving the evolution of species?

Accepted Answer

Natural selection

Question 3

Which of the following statements about natural selection is TRUE?

Accepted Answer

Natural selection acts on existing heritable variation within a population.

Question 4

Refer to the Hardy-Weinberg equations shown in the third image. If $$p = 0.7$$ and $$q = 0.3$$, what is the expected frequency of heterozygotes in the population?

Accepted Answer

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

Question 5

Which of the following is an example of genetic drift?

Accepted Answer

A small group of birds colonizes a new island, and their gene pool differs from the original population.

Question 6

What does each branch point on an evolutionary tree represent?

Accepted Answer

A common ancestor of all species that radiate from it

Question 7

Which of the following is NOT a source of genetic variation in populations?

Accepted Answer

Acquired traits during an individual's lifetime

Question 8

A population of insects is exposed to a new pesticide. After several generations, most of the population is resistant. Which evolutionary mechanism is most likely responsible for this change?

Accepted Answer

Natural selection

Question 9

Which of the following best describes the concept of 'relative fitness'?

Accepted Answer

The contribution an individual makes to the gene pool of the next generation relative to others

Question 10

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

Accepted Answer

No mutation, random mating, no gene flow, infinite population size, and no selection

Question 11

Which of the following scenarios illustrates the founder effect?

Accepted Answer

A few individuals from a population start a new colony, resulting in a gene pool that differs from the original population.

Question 12

Which of the following is a correct interpretation of the second image, which shows overproduction of offspring and individual variation leading to natural selection?

Accepted Answer

Natural selection results from the fact that more offspring are produced than can survive, and individuals vary in their traits.

Question 13

Which of the following is an example of disruptive selection?

Accepted Answer

Both very light and very dark colored mice are favored over intermediate colored mice in a patchy environment.

Question 14

Why is mutation considered the ultimate source of genetic variation?

Accepted Answer

It creates new alleles that did not previously exist in the population.

Question 15

Which of the following best describes gene flow?

Accepted Answer

The movement of alleles between populations due to migration

Question 16

A population of 1,000 individuals has 360 individuals with genotype $$aa. $$Using the Hardy-Weinberg equation, what is the frequency of allele $$a$$?

Accepted Answer

$$q = \sqrt{\frac{360}{1000}} = 0.6$$

Question 17

Which of the following is a real-world example of stabilizing selection?

Accepted Answer

Human birth weights are most commonly in the intermediate range, with very low and very high weights having higher mortality.

Question 18

Which of the following statements about evolutionary trees is correct?

Accepted Answer

They show the evolutionary relationships among species, with each branch point representing a common ancestor.

Question 19

Which of the following is an example of sexual selection?

Accepted Answer

Male peacocks with larger, more colorful tails are more likely to attract mates.

Study Guide: The Evolution and Diversity of Life

Study Guide - Practice Questions

Study Guide - Flashcards