Genetic Drift

What is genetic drift?

• A change in allele frequencies due to random sampling effects

• A change in allele frequencies due to natural selection

• A change in allele frequencies due to mutation

• A change in allele frequencies due to gene flow

Tags

NGSS.HS-LS4-3

Which of the following is an example of genetic drift?

• A population bottleneck

• Directional selection

• Stabilizing selection

• Gene flow

Genetic drift is most likely to occur in which type of population?

• Small populations

• Large populations

• Populations with high mutation rates

• Populations with high gene flow

Tags

NGSS.HS-LS2-2

What is the founder effect?

• A type of genetic drift that occurs when a small group of individuals colonizes a new area

• A type of genetic drift that occurs due to a sudden reduction in population size

• A type of genetic drift that occurs due to random mating

• A type of genetic drift that occurs due to natural selection

Which of the following statements about genetic drift is true?

• It can lead to the fixation or loss of alleles in a population

• It always increases genetic variation within a population

• It is a form of natural selection

• It only occurs in large populations

How does genetic drift differ from natural selection?

• Genetic drift is random, while natural selection is non-random

• Genetic drift always increases fitness, while natural selection does not

• Genetic drift only occurs in large populations, while natural selection occurs in all populations

• Genetic drift is a type of mutation, while natural selection is not

Tags

NGSS.HS-LS4-4

What is a population bottleneck?

• A sharp reduction in the size of a population due to environmental events or human activities

• The introduction of new alleles into a population through migration

• The gradual change in allele frequencies due to natural selection

• The increase in genetic variation due to mutation

Tags

NGSS.HS-LS4-2

Which of the following can result from genetic drift?

• Loss of genetic variation

• Increase in genetic variation

• Introduction of new alleles

• Increase in population size

In a small population, genetic drift can lead to:

• Random changes in allele frequencies

• Increased genetic diversity

• Increased population size

• Increased mutation rates

Tags

NGSS.HS-LS4-2

The founder effect is a type of genetic drift that occurs when:

• A small group of individuals establishes a new population

• A large population undergoes a sudden reduction in size

• New alleles are introduced into a population

• Alleles are lost due to natural selection