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Gullett-Biology-Unit

Biology Unit 3 - Natural Selection

TermDefinition
artificial selection the human practice of breeding animals or plants that have certain desired traits
heritability ability of a trait to be passed from one generation to the next
natural selection the process by which individuals that are better adapted to their environment survive and reproduce more successfully than less well adapted individuals do; a theory to explain the mechanism of evolution
fitness a measure of an organism's ability to survive and reproduce offspring relative to members of a population
gene pool the total set of genes, including all the alleles, that are present in a population at any one point in time
allele frequency proportion of one allele, compared with all the alleles for that trait, in the gene pool
normal distribution a distribution of numerical data whose graph forms a bell-shaped curve that is symmetrical about the mean
directional selection a natural selection process in which one genetic variation is selected and that causes a change in the overall genetic composition of a population
stabilizing selection a type of natural selection in which the average form of a trait is favored and becomes more common
disruptive selection a type of natural selection in which two extreme forms of a trait are selected
population a group of organisms of the same species that live in a specific geographic area
Created by: lpgullett
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