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BILD3

Lecture 8

TermDefinition
Macro evolution major evolutionary change. The term applies mainly to the evolution of whole taxonomic groups over long periods of time.
Micro evolution evolutionary change within a species or small group of organisms, especially over a short period
Gene flow transfer of alleles into or out of a population as a result of the movement of fertile individuals or their gametes (e.g. pollen)
Genetic drift Change in the genetic composition of a population caused by chance events unrelated to fitness that shrink the population size
Bottleneck (population stays in the same place) Sudden population decrease changes allele frequencies. Can have huge effect in one generation entirely by chance
Founder effect (subset separates to “found” a new population) A small number of individuals start a new population and the gene frequencies of the new populations are different from the source population
Created by: stacymdez