WorksheetsGenetic Drift and Gene Flow
Total questions: 25
Worksheet time: 25mins
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.
What is gene flow?
The addition or removal of alleles in a population due to individuals entering or leaving one population for another
A change in allele frequencies when a new population arises from only a few individuals
A reduction in population caused by natural disasters, disease, hunting, etc.
A change in the gene pool due to chance
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
What mechanism of evolution occurs when allele frequencies change over generations due to random chance?
Genetic Drift
Mutation
Natural Selection
Gene Flow
Select the best answer based on the image.
Gene Flow
Genetic Drift
A gene pool consists of (a) frequencies that can change randomly through generations due to chance.
Select all answers below that describe the founder effect.
Changes allele frequencies
Occurs when a new population arises from only a few individuals
Can result in a loss of genetic diversity
Is caused by a disaster that kills off most individuals in a population
True of False: Evolution is the change in relative frequency of alleles in a population over time
True
False
Different colors represent different varieties found in a population, Which population has a larger gene pool?
circle on the left
middle circle on the right
The image represents which process?
founder effect
bottleneck effect
gene flow
The 3 butterflies in the top right of the image left the original population and started a new population. This is an example of:
gene flow
founder effect
bottleneck effect
This image is an example of:
genetic drift
gene flow
Genetic drift is driven by chance, not natural selection
true
false
A forest fire ignites and kills many members of a population of rattlesnakes. This is an example of:
gene flow
genetic drift
mutation
Genetic diversity is increased through:
genetic drift
gene flow
A forest fire ignites in the Sam Houston State Forest and kills many members of a population of pigmy rattlesnakes.
Gene Flow
Genetic Drift
Genetic Drift is more likely to happen in...
aquatic populations
small populations
terrestrial populations
older populations
Which of the following best describes genetic drift?
A change in allele frequencies due to random chance
The movement of alleles between populations
The introduction of new alleles through mutation
The selection of advantageous traits
Gene flow is most likely to occur in which of the following scenarios?
A population of birds migrating to a new island
A small isolated population of insects
A large population of fish in a stable environment
A group of plants reproducing asexually
What is the primary effect of genetic drift on a population?
Increases genetic diversity
Decreases genetic diversity
Stabilizes allele frequencies
Promotes natural selection
Which of the following is an example of gene flow?
A bee carrying pollen from one flower population to another
A natural disaster reducing a population's size
A mutation occurring in a single individual
A predator preferentially hunting a specific phenotype
In a small population, genetic drift can lead to:
Increased genetic variation
Loss of rare alleles
Increased mutation rates
Stable allele frequencies
How does gene flow affect genetic variation within a population?
Increases genetic variation
Decreases genetic variation
Has no effect on genetic variation
Leads to genetic drift
Which of the following scenarios is most likely to result in genetic drift?
A small group of animals colonizing a new area
A large population with high genetic diversity
A stable environment with no migration
A population undergoing strong natural selection
