Population	Natural Selection	Adaptation	Species	Evolution
A group of organisms of the same species that live in a specific geographical area and interbreed.	The process by which individuals that have favorable adaptations and are better adapted to their environment survive and reproduce more successfully than less well adapted individuals.	The process of becoming adapted to an environment; an anatomical, physiological, or behavioral change that improves a population’s ability to survive.	A group of organisms that are closely related and naturally mate to produce fertile offspring	The development of organisms from other organisms.

Genetic Drift	Variation	Adaptive Radiation	Reproductive Isolation	Bottleneck Effect
The random change in allele frequency in a population.	A difference or deviation in structure or character from others of the same species or group	The diversification of an ancestral group of organisms into a variety of related forms specialized to fit different environments or ways of life, each often further diversifying into more specialized types.	The inability of members of a population to successfully interbreed with members of another population of the same species or a related species.	A dramatic reduction in the size of a population (as of a species) that results in a decrease in genetic variation.

Gene Pool	Founder Effect
The genetic information of a population of interbreeding organisms.	The effect on the resulting gene pool that occurs when a new isolated population is started by a small number of individuals possessing limited genetic variation relative to the larger population from which they have migrated.