Allele Frequency and Genetic Drift

Someone steps on some bugs and randomly removes their alleles from the population. This is an example of

• gene flow

• genetic drift

• speciation

• allele frequency

Tags

NGSS.HS-LS4-4

A drastic reduction in the size of a population that can change allele frequencies is called

• the bottleneck effect

• the founder effect

• the gene flow effect

• the Thanos effect

The allele frequencies of the mouse population in the picture are changing over time. Which is true?

• The population is evolving.

• The population is not evolving.

• The population will go extinct.

• The population's genetic variation is increasing.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

NGSS.HS-LS4-4

There are 3 T alleles and 7 t alleles in a population. Calculate the frequency of the recessive allele.

• 30%

• 70%

• 10%

• 4%

Tags

NGSS.HS-LS3-3

In small populations, genetic drift can lead to:

• Increased genetic variation.

• Decreased genetic variation.

• Constant genetic variation.

• Increased mutation rates.

What is the frequency of the dominant allele in this population?

• 30%

• 50%

• 63%

• 37%

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS3-3

The founder effect differs from the bottleneck effect in that it:

• Occurs only in large populations.

• Results from a drastic reduction in population size.

• Involves the establishment of a new population by a few individuals.

• Increases genetic variation.

A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.

• Gene Flow

• Genetic Drift

Tags

NGSS.HS-LS2-6

NGSS.HS-LS4-5

How does genetic drift affect a population's ability to adapt to new environments?

• It increases a population's adaptability by increasing genetic variation.

• It decreases a population's adaptability by potentially reducing genetic variation.

• It has no effect on a population's adaptability.

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

• A population's size increases rapidly.

• A population migrates to a new environment.

• A population's size is reduced drastically.

• A population's genetic variation increases.

Tags

NGSS.HS-LS4-5