Population Evolution

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

• Gene Flow

• Genetic Drift

Select the best answer based on the image.

• Gene Flow

• Genetic Drift

Genetic diversity is decreased through this process.

• Gene Flow

• Genetic Drift

Select the best answer based on the image.

• Gene Flow

• Genetic Drift

Genetic Diversity is increased through this process.

• Gene Flow

• Genetic Drift

The _________________ _________________ occurs when there is a reduction in population due to natural disasters, over hunting or disease.

• founder effect

• gene flow

• bottleneck effect

• 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

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

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

Some female peacocks prefer males with large, colorful tales while other female peacocks prefer males with no tail at all. Females are beginning to only mate with the type of males with the tail they prefer. What type of reproductive barrier is this?

• behavioral isolation
• hybrid sterility 
• temporal isolation
• mechanical isolation