Evolution/Classification

In natural selection, the selective agent is the

• humans
• mutations
• breeders
• environment

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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

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Some organisms that share a common ancestor have features that have different functions, but similar structures.  These are known as

• vestigial structures
• analogous structures
• homologous structures
• fossil structures

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What increases genetic variation when animals move from one population to another

• genetic drift
• sexual selection
• bottleneck effect
• gene flow

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This mechanism of evolution occurs when populations migrate.

• Extinction
• Gene flow
• Genetic drift
• Natural Selection

Happens only in small populations, and is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.

• Extinction
• Genetic Drift
• Bottleneck Effect
• Founder Effect

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.

Evolution is affected by the random movement of alleles from one population to another. This is known as gene flow. Which of the following examples does NOT represent gene flow?

• A group of red parrots are blown to an isolated island by a hurricane. There they begin to breed and produce offspring.

• Several red foxes move into and mate with a silver fox population.

• A populations of moths with white alleles breed with a population of darker-colored moths. Producing white offspring.

• he pollen from flowers on both sides of a river is blown across the river and pollinates the other group

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For years antibiotics were prescribed by doctors to kill infection causing bacteria. Now there are bacteria which have evolved to resist antibiotics. Which is the final event that occurred during this process.

• resistant organisms reproduced

• resistant organisms survived while others were killed

• resistant organisms occurred by mutation

• non resistant organisms mutated.

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In evolution, which driving factor most consistently requires a small population as a precondition for its occurrence?

a. mutation

b. nonrandom mating

c. genetic drift

d. natural selection

• mutation

• nonrandom mating

• genetic drift

• natural selection