OpenStax Biology2e Chapter 19 The Evolution of Populations

Population genetics is the study of:

• how selective forces change the allele frequencies in a population over time

• the genetic basis of population-wide traits

• whether traits have a genetic basis

• the degree of inbreeding in a population

When a population is in Hardy-Weinberg equilibrium, what is NOT happening to the species?

• Survival
• Reproduction
• Death
• Evolution

Which of the following populations is not in Hardy-Weinberg equilibrium?

• a population with 12 homozygous recessive individuals (yy), 8 homozygous dominant individuals (YY), and 4 heterozygous individuals (Yy)

• a population in which the allele frequencies do not change over time

• p² + 2pq + q² = 1

• a population undergoing natural selection

One of the original Amish colonies rose from a ship of colonists that came from Europe. The ship’s captain, who had polydactyly, a rare dominant trait, was one of the original colonists. Today, we see a much higher frequency of polydactyly in the Amish population. This is an example of:

• natural selection

• genetic drift

• founder effect

• both genetic drift and founder effect

When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms?

• natural selection

• genetic drift

• gene flow

• random mating

Which of the following evolutionary forces can introduce new genetic variation into a population?

• natural selection and genetic drift

• mutation and gene flow

• natural selection and nonrandom mating

• mutation and genetic drift

These birds are both pheasants. They show an example of ...

• Bioindicator
• Bimorphism
• Dimorphism
• Diagnostic

All the possible gene combinations in a population.

• allele

• gene pool

• genome

• mitosis

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

Average phenotypes are favored in the environment, while extremes have lower survival rates.

• seasonal selection

• distruptive selection

• directional selection

• stabilizing selection

Which Hardy-Weinberg factor represents the frequency of heterozygous individuals in a population?

• p²

• 2pq

• q²

• p² + 2pq