Genetic Drift, Natural Selection, Gene Flow

The United States is known as a melting pot because many different types of people compose society. People from all parts of the world have moved to the United States in search of religious freedom, to escape poverty or violence, or as a refugee after being displaced due to environmental factors. Which of these is a likely outcome of movement by people?

• Gene flow occurs between populations.

• Allele frequencies suddenly change dramatically.

• Relative genotypic frequencies reach a constant state.

• Intermediate phenotypes increase in the species.

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What mechanism of evolution occurs when allele frequencies change over generations due to random chance?

• Genetic Drift

• Mutation

• Natural Selection

• Gene Flow

Due to hunting, the population of Northern elephant seals was reduced to 20 individuals at the end of the 19th century. Since then, their population has since rebounded to over 30,000. What is the most likely long-term effect of hunting on the elephant seal population?

• The population has allele frequencies similar to those in the original population

• The population is more likely to survive disease

• The population contain high allelic diversity

• Individuals are genetically similar to each other

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A small group of squirrels gets separates them from the rest of the population due to a large flood. These squirrels, now confined to this new island, begin to start a new population. This is an example of which of the following?

• Founder effect

• Bottleneck effect

• Natural Selection

• Gene Flow

What is the difference between genetic drift and natural selection. SELECT ALL THAT APPLY

• Natural Selection creates adaptations and Genetic Drift does not.

• Natural Selection is not random and Genetic Drift is.

• Natural Selection passes on any trait and Genetic Drift passes on specific traits.

• Natural Selection happens over a single generation and Genetic Drift happens over multiple generations.

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