Mechanisms of Evolution BellRinger

Northern elephant seals have reduced genetic variation probably due to the effects humans inflicted on them in the 1890s. Hunting reduced their population size to as few as 20 individuals at the end of the 19th century. What evolutionary concept is displayed in this example?

• Bottleneck Effect

• Founder Effect

• Directional Selection

• Frequency Dependent Selection

Genetic diversity is decreased through this process.

• Gene Flow

• Genetic Drift

• Mutation

• Evolution

61% accuracy: In rock pocket mice, for thousands of years the dominant fur color is lighter colored fur. Occasionally a mouse will be born with a change in the MC1R gene, which causes a darker fur color. This change is an example of a(n)...

• gene flow

• natural selection

• mutation

• artificial selection

All the possible gene combinations in a population.

• allele

• gene pool

• genome

• mitosis

Which of the following is true?

• Gene pool frequencies do not change as a result of migration in or out of a population.
• Gene flow occurs only as a result of isolation of a small population.
• Gene flow can cause new alleles to enter a population's gene pool.
• Gene flow is due the the selection of the most favorable traits.

The exchange of genes between two populations due to migration

• Genetic Drift

• Founder Effect

• Gene Flow

• Genetic Recombination

A type of genetic drift in which small groups of organisms separate from a larger population and form new small colonies.

• Gene Flow

• Founder Effect

• Natural Selection

• Artificial Selection

Which word means the formation of new species?

• speciation

• specialization

• founder effect

• sexual selection

Genetic drift is change in the allele frequency of a population due to...

• random chance

• natural selection

• non-random mating (sexual selection)

• artificial selection

Mutations are important because they bring about

• death of the organism in which they develop

• genetic variation needed for a population to evolve

• benefits for the individual, not for the population

• Hardey-Weinberg equilibrium within a population