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24 Cards in this Set

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Adaptation
an organism modification in structure, function of behavior which increases the likelihood of continued existence
Evolution
The decent of organisms from common ancestors with the development of genetic it phenotypic changes over time that make them more suited to the local environment
Fitness
The ability of an organism to survive and reproduce in its environment
Homologous Structure
In evolution, a structure that is similar in different organisms because these organisms are are drived from a common ancestor
Natural Selection
The guiding force of evolution caused by environmental selection of organisms most fit to reproduce, resulting in adaptation
Vestigial structure
The remains of a structure that was fuctional in some ancestor but is no longer functional in the organism in a question
Directional Selection
An outcome of natural selection in which on extreme phenotype in favored, usually in a changing environment
Disruptive Selection
An outcome of natural selection in which extreme phenotypes are favored over the average phenotype and can lead to more than one distinct form
Gene flow
The sharing of genes between two populations through interbreeding
Gene Pool
The total of all the genes of all the individuals in a population
Genetic Drift
A change in the genetic make up of a population due to chance (random) events; important in small populations or when only a few individuals mate
Population
a group of organisms of the same species occupying a certain area and sharing a commnon gene pool
Speciation
A process by which a new specie is originated or produced
Species
A taxonomic category that is th edivision of a genus; its members can breed successfully with each other but not with members of another specie
Stabilizing Selection
An outcome of natural selection in which extreme phenotypes are eliminated and the average phenotype is conserved
Continental Drift
The movement of continents relativeto each other on Earth's surface
Extinction
The total disappearance of a specie or higher group
Mass Extinctionan
an episode of large-scale extinction in which large numbers of species disappear in a few million years or less
Ocean ridge
The ridge on the ocean floorwhere oceanic crust forms and from which it moves laterally in each direction
Ozone Shield
Formed from oxygen in the upper atmosphere, it protects the earth from ultraviolet radiation
Plate tectonics
The study of the behavior of earth's crust in terms of moving plates that are formed at the ocean ridges and destroyed at suduction zones
Mammal
a member of a class of vertebrates characterized especially bu the presence of hair and mammary glands
Primate
Animal that belongs to the order Primates, the order of mammals that includes prosimians, monkeys, apes, and humans
Prosimian
A group of primates that includes lemurs and tarsiers and may resemble the first primates to have evolved