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Biology Ch 16

Evolution of Populations

Proof of evolution Fossils
Random change in allele frequencies Genetic Drift
Formation of a new species Speciation
Genetic drift from population migration Founder Effect
Main source of variation Mutations
Sharp climatic shift Episodic Speciation
Ability to survive and reproduce Fitness
Potential lethal allele carrier Heterozygote
Species can no longer interbreed with original species Reproductive Isolation
Variation within a species, helps ensure species survival Biodiversity
Sharp and sudden decrease in specie numbers Mass Extinction
Happens during meiosis, alleles trade locations Gene Shuffling
Physical separation such as rivers or mountains Geographic Isolation
Change that increases survival chances Adaptation
Individuals in the middle or norm are most fit Stabilizing Selection
Bell curve shifts to the left OR right Directional Selection
Bell curve shifts to the left AND right simultaneously Disruptive Selection
Created by: Mrs.Benc



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