Evolution and Natural selection

Evolution

Change over time, change of a population’s gene pool over time

Natural Selection

Individuals better adapted to the environment are able to survive and reproduce

AKA survival of the fittest

Population

Group of individuals of same species that interbreed

Gene Pool

All genes present in a population

Combined genetic info of all members

Allele frequency is # of times alleles occur.

Evolution in populations

Occurs when there is a change in relative frequency of alleles

Stabilizing Section

Shifts to Middle range

Distruptive selection

Shifts 2 two extremes, can lead to speciation

Directional Selection

Shifts to 1 extreme

Speciation

The formation of new species, as species evolve, populations become reproductively isolated.

Reproductive Isolation

Members of 2 populations cannot interbreed and produce fertile offspring