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Biology Vocab 4/25
Biology vocabulary quiz of 4/25 in Mrs. Emerson's class.
6
Biology
9th Grade
04/22/2014
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Term
Directional Selection
 Definition
An environmental force pushing allele frequencies one way.
Term
Disruptive Selection
 Definition
An environmental force pushing allele frequencies in the center to both sides.
Term
Stabilizing Selection
 Definition
An environmental force pushing against each side of allele frequencies.
Term
Genetic Drift
 Definition
Allele frequency change due to chance (random).
Term
Founder Effect
 Definition
When a population starts from a few individuals.
Term
Bottleneck
 Definition
When a large population is reduced in size - a small number starts the new population.
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