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10 Terms
What evolves?
Populations, not individuals.
What is evolution?
Change in allele frequencies across generations.
What are the three mechanisms of evolution?
Natural selection, genetic drift, and gene flow.
What is genetic drift?
Random change in allele frequencies.
What happens to drift in small populations?
It becomes stronger.
What are the three types of natural selection?
Directional, stabilizing, and disruptive.
What are the two types of reproductive isolation?
Prezygotic and postzygotic.
What is allopatric speciation?
Speciation caused by geographic separation.
What is sympatric speciation?
Speciation without geographic separation.
Can speciation occur without natural selection?
Yes