Genetic Drift

In which type of populations does genetic drift usually occur?

• Large populations with stable allele frequencies

• Small populations

• Populations with high mutation rates

• Populations undergoing natural selection

What does the Founder Effect refer to in the context of evolution and genetic change in populations?

• The effect of natural selection on a large, diverse population

• The genetic drift that occurs when a new population is established by a very small number of individuals from a larger population

• The increase in genetic mutations when a population size becomes too large

• The process by which a new species is created from an existing species

What does allele frequency refer to in a gene pool?

• The number of genes in the pool

• The number of times an allele occurs in a gene pool, compared to the total number of alleles in that pool for the same gene

• The total number of alleles for all genes in the pool

• The percentage of genes that are homozygous for a given allele

What is the bottleneck effect in the context of genetic change in populations?

• An increase in genetic diversity due to mutation

• A change in allele frequency following a dramatic increase in the size of a population

• A change in allele frequency following a dramatic reduction in the size of a population

• The introduction of new alleles into a population through migration

A few deer wander out of their native woods into a completely new park where no deer had ever been before. They go on to create an entirely new population. What is this an example of?

• Genetic Drift

• Natural Selection

Tags

8-LS4-4

During a hurricane, a population of beetles almost gets completely wiped out. The only beetles that survived were lucky that they were in their nest at the time of the hurricane and had enough food to survive. What is this an example of?

• Natural selection

• Genetic Drift

Tags

8-LS4-4

A forest fire ignites in the Chattahoochee National Forest and kills many members of a population of pigmy rattlesnakes. What is this an example of?

• Natural Selection

• Genetic Drift

Tags

8-LS4-4

What is genetic drift?

• A random change in allele frequencies in a population

• A process of natural selection

• A mutation in the genetic code

• A form of genetic recombination

Tags

NGSS.HS-LS4-2

Which of the following scenarios is an example of genetic drift?

• A large population of rabbits with stable allele frequencies

• A small group of birds colonizing a new island

• A population of fish adapting to a new predator

• A species of plants undergoing photosynthesis

Tags

NGSS.HS-LS4-2

How does genetic drift affect genetic variation in a population?

• It increases genetic variation

• It decreases genetic variation

• It has no effect on genetic variation

• It stabilizes genetic variation

Tags

NGSS.HS-LS4-2