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BILD3
Lecture 8
Term | Definition |
---|---|
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 |