Bio 7E Genetic Drift Review

A change in a gene

• replication

• translation

• mutation

• transcription

Genetic drift is driven by chance, not natural selection

• true

• false

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.

• gene pool 
• founder effect
• bottleneck
• mutation

Ten years ago, in a small population of ducks, two sizes of eyes were observed, large and small. Three ducks have large eyes and 7 have small.  2 of the large-eyed ducks are randomly hit by cars and killed. Today, no large-eyed ducks are present in the population.

• gene flow
• bottleneck
• mutation
• founders

Sometimes traits begin to disappear from species even if they are beneficial. What causes this to happen?

• gene flow

• mutation

• genetic drift

• natural selection

What is the best way to describe what is happening in this diagram?

• the surviving population has a smaller gene pool and therefore has less genetic diversity

• the surviving population has a larger gene pool and therefore has less genetic diversity

• the surviving population has a smaller gene pool and therefore has more genetic diversity

• the surviving population has a larger gene pool and therefore has more genetic diversity

What is the main difference between genetic drift and natural selection?

• Genetic drift involves changes in allele frequencies due to chance, while natural selection involves changes due to differential survival and reproduction.

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

• Genetic drift increases genetic variation, while natural selection decreases it.

• Genetic drift is a predictable process, while natural selection is random.

Match the following

• Bottleneck Effect

• reduction in genetic variation due to a smaller population moving away from a larger population

• Founder's Effect

• changes in gene frequency in a population due to change

• Genetic Drift

• reduction in genetic variation due to dramatic events

• Natural Selection

• survival of the fittest

What does this image show?

• Gene Flow

• Founder's Effect

• Bottleneck Effect

• Natural Selection

The bottleneck effect ​___________ biodiversity in a population.

• decreases

• increases

• does not effect