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Natural Selection

Natural Selection Vocab

TermDefinition
Adaptation the process of becoming adapted to an environment; an anatomical, physiological, or behavioral change that improves a population's ability to survive
Convergent evolution (convergence) The process by which unrelated species become more similar as they adapt to the same kind of environment
Directional selection a natural selection process in which one genetic variation is selected and that causes a change in the overall genetic composition of the population
Disruptive selection form of natural selection in which a single curve splits into two; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle
Gene Pool the combined genetic information of all members of a particular population
Genetic drift the random change in allele frequency in a population
Stabilizing selection type of natural selection in which the average form of the trait is favored and becomes more common
Speciation Evolution of a new species, An evolutionary process in which one species splits into two or more species.
Vestigial Structures A feature of an organism that is a historical remnant of a structure that served a function in the organism's ancestors.
Homologous Structures Structures in different species that are similar because of common ancestry. Features that have different functions but are structurally similar> indicating common ancestry.
Analogous Structures structures that do not have a common evolutionary origin but are similar in function
Embryology study of embryonic development, development of life before birth
Fossil Record The chronicle of evolution over millions of years of geologic time engraved in the order in which fossils appear in rock strata.
Gene Frequency A measure of the occurrence of an allele in a population.
Natural Selection A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals that do not have those traits.
Created by: Christensent