Unit 4 Vocabulary Test

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Genetic Drift

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The sum total of all the different forms of genetic information carried by a particular species, or by all organisms on Earth.

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Sexual Selection

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The selection of mates based on heritable traits.

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Adaptation

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Heritable characteristics that increase an organism's ability to survive and reproduce in an environment.

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Genetic Equilibrium

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A situation in which allele frequencies in a population remain the same.

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Behavioral Isolation

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A form of reproductive isolation in which two populations develop differences in courtship rituals or other behaviors that prevent them from breeding.

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Allele Frequency

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The relative frequency of an allele (variant of a gene) at a genetic locus in a population.

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Bottleneck Effect

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A sharp reduction in the size of a population due to environmental events or human activities, leading to a loss of genetic diversity.

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Founder Effect

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Genetic variation that occurs when a small group of individuals becomes isolated from a larger population.

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Directional Selection

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A mode of natural selection in which a single phenotype is favored, causing the allele frequency to shift in one direction.

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Disruptive Selection

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A type of natural selection that favors extreme values of a trait over intermediate values.