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Evolution

TermDefinition
EVOLUTION Changes in genetic composition of a population Through successive generations
GENETIC DRIFT The process by which gene frequencies in small populations are changed
MIGRATION Organism movement
EMIGRATION Refers to the movement of organisms out of a group
IMMIGRATION The movement of organisms into a group
SPECIES A group of organisms of similar structure; Capable of mating AND producing offspring
ADAPTATION Changes in structure or function Allows for success of a species To survive all living things NEED to be suited to its environment. i.e., Squirrels have sharp, strong claws for gripping tree trunks
ADAPTIVE RADIATION A species evolves into various subgroups adapting differently to the environment; Evolutionary pattern by which a single ancestral species evolves into many species
NATURAL SELECTION Organism with favorable trait reproduces at higher rate
TAXONOMY Science of classifying organisms based on evolutionary relationships
CLASSIFACATION LEVELS Every organism can be classified at 7 different levels - kingdom, phylum, class, order, family, genus & species. Each level contains organisms with similar characteristics. Kingdom largest group & very broad.
JEAN BAPTISTE LAMARCK Evolution Contributor; Believed organism made changes to adapt to their environment; Passed on these acquired traits to offspring
CHARLES DARWIN Evolution Contributor; Believed in theory of natural selection
EVOLUTION seeks to ANSWER: (1) What causes a species to change? (2) How does an organism realize it has to adapt?
SPECIATION The creation of new species; i.e., When subgroups are isolated for long periods they become so different they are a new species
Created by: pj johnson
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