Q: A population of beetles has two alleles for color: B (black) and b (brown). If the frequency of B is 0.7 and b 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 Darwin's theory of evolution by natural selection?

Accepted Answer

Species with heritable traits that increase survival and reproduction become more common in a population over generations.

Question 2

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

Accepted Answer

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

Question 3

A population of beetles has two alleles for color: B (black) and b (brown). If the frequency of B is 0.7 and b 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 4

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

Accepted Answer

Small population size

Question 5

Which evidence most strongly supports the theory of evolution by natural selection?

Accepted Answer

The presence of vestigial structures in different species

Question 6

Which scientist's work on inheritance and pea plants provided a foundation for understanding genetic variation in populations?

Accepted Answer

Gregor Mendel

Question 7

Which of the following is an example of allopatric speciation?

Accepted Answer

A population of squirrels is separated by a canyon, leading to the evolution of two distinct species.

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 a prezygotic reproductive barrier?

Accepted Answer

Temporal isolation, where species breed at different times.

Question 10

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

Accepted Answer

Mutation

Question 11

Which of the following best describes adaptive radiation?

Accepted Answer

The rapid evolution of many species from a common ancestor when new habitats become available.

Question 12

Which of the following is a postzygotic barrier?

Accepted Answer

Hybrid sterility

Question 13

Which of the following statements about Lamarck's theory of evolution is correct?

Accepted Answer

Lamarck proposed that acquired traits could be inherited by offspring.

Question 14

Which of the following is an example of convergent evolution?

Accepted Answer

The wings of bats and birds, which evolved independently for flight.

Question 15

Which of the following best describes the founder effect?

Accepted Answer

A small group of individuals establishes a new population, leading to reduced genetic diversity.

Question 16

Which of the following is a homologous structure?

Accepted Answer

The forelimbs of humans and whales, which have similar bone arrangements.

Question 17

Which of the following is a correct statement about microevolution?

Accepted Answer

Microevolution refers to changes in allele frequencies within a population over time.

Question 18

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

Accepted Answer

Antibiotic resistance in bacteria due to the survival of resistant strains.

Question 19

Which of the following best explains why vestigial structures are important evidence for evolution?

Accepted Answer

They show that species have changed over time and retain remnants of ancestral features.

Question 20

Which of the following would most likely lead to sympatric speciation in animals?

Accepted Answer

The development of a new mating behavior within a population.

Study Guide: Evolution, Population Genetics, and the History of Life (Chapters 22–25)

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