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Category 3

EOC STAAR

TermDefinition
Genetic Drift An evolutionary mechanism in which allele frequencies change in a population
Recombination Another source of heritable variation that occurs for two main reasons: independent assortment and crossing-over.
Gene Flow When the genes of one population flow to a different population.
Fossils What are preserved traces or remains of living organisms for the past
Vestigial Structures Structures on an organism are degenerated and, or are nonfunctional structures
Homologous Structures Structures that are similar in related organisms which were inherited from a common ancestor
Analogous Structures Structure that is the same in function but different in structure, and evolved independently
Molecular Homologies Evidence of evolution that has similar stretch of genetic material and/or proteins between different organisms
Biogeography This is the study of the distribution of species, organisms, and ecosystems through geological time
Stabilizing Selection most common form of natural selection in which organisms with extreme expressions of a trait are removed. Can be expressed on a graph
Directional Selection Shift of population toward an extreme version of a beneficial trait. Can be expressed on a graph
Disruptive Selection Process by which individuals with average traits are removed, creating two populations with extreme traits. Can be expressed on a graph.
Natural Selection Process that results in the adaptation of an organism to its environment by means of selectively reproducing changes in its genotype.
Evolution The process through which species change over time.
Species Groups of actually or potentially interbreeding populations, which are reproductively isolated from other such groups.
Adaptation Process by which an animal or plant species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation.
Taxonomy A hierarchical system for classifying and identifying organism
Common Ancestor The most recent ancestral form or species from which two different species evolved.
Created by: melissa1334