Biology Evolution Unit

microevolution :: a change in allele frequencies

macroevolution :: genetic changes lead to the development of a new species

evolution :: change in a species over time

phenotypes :: observable traits

evidence of evolution :: population shrinks in size due to chance events, non-random mating, genetic mutation, migration, natural selection

genetic drift :: small population

gene flow :: migrations

natural selection :: causes a trait to become more or less common in a population based on usefulness and if it aids the organisms in staying alive

natural selection is present if :: variability, heritability, and a reproductive advantage are present (all three MUST be present)