Gene Flow and Genetic Drift

In which of the following populations would genetic drift be most likely to cause a rapid evolution of the population?

• The human population of India

• A large population of Mexican free-tailed bats living in central Texas

• A geographically isolated population of 5000 green tree frogs

• A small group of 12 cheetahs living in Namibia

Genetic drift occurs most quickly in -

• small populations.

• populations with large genetic variation.

• populations with small genetic variation.

• large populations.

Tags

NGSS.HS-LS2-2

What is genetic drift?

• A population for which the gene frequencies do not change

• A change in allele frequencies due to selection

• The addition or removal of alleles in a population due to individuals entering or leaving one population for another

• A change in the gene pool due to chance

Green rhinocerous beetles are some of the biggest beetles to exist on Earth. A green rhinocerous beetle leaves its group and wonders over to another group that only has red rhinocerous beetles and mates with the red beetles. This is an example of:

• Gene Flow

• Genetic Drift

• Mutation

• Migration

Tags

NGSS.HS-LS3-2

Select the best answer based on the image.

• Gene Flow

• Genetic Drift

What mechanism of evolution occurs when allele frequencies change over generations due to random chance?

• Genetic Drift

• Mutation

• Natural Selection

• Gene Flow

A gene pool consists of ____________ frequencies that can change randomly through generations due to chance.

Reindeer from a rancher in Alaska escape from their pen during an enormous snow storm. After their escape, they mate with wild caribou that are migrating across the land. The offspring of these have traits for short legs and have tame behavior.

• Gene Flow

• Genetic Drift

• Non-Random Mating

• Natural Selection

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

The country of Sweden is known for having people with blonde hair and blue eyes. One day a family moves from Sweden to India where dark hair and dark eyes are very common. A female from Sweden marries a male from India and their offspring now have blonde hair and blue eyed traits.

• Natural Selection

• Mutation

• Non-Random Mating

• Gene Flow

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

A certain type of plant can produce blue or yellow flowers. During a fire, many yellow flowers are destroyed and now since blue is the dominant trait, the plant reproduces offspring that produce only blue flowers.

• Non-Random Mating

• Gene Flow

• Mutation

• Genetic Drift

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

NGSS.HS-LS4-5