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This Concept Map, created with IHMC CmapTools, has information related to: Evolution of Populations- Group 2, Evolution of Populations Populations evolve by Genetic Drift, Evolution of Populations Populations evolve by Natural Selection, Stabalizing selection Definition Removes extreme variations from the population & preserves intermediate types, Balancing selection Includes Frequency dependant selection, Frequency distribution of heretible traits Types Directional selection, Evolution of Populations Populations evolve by Gene Flow, Genetic Drift Key points Can cause harmful alleles to be fixed, Mutations Create New alleles, Natural Selection causes Sexual selection, Intrasexual selection Type Sexual selection, Balancing selection Includes Heterozygous advantage, Gene Flow Definition The movement of alleles between individuals and populations, Genetic Drift Reduces Ability to survive in the environment, Cannot fashion perfect organisms Reason 1 Selection can act only byt existing variations, Natural Selection Preserves variation Balancing selection, New alleles Opportunity for Natural Selection, Intrasexual selection Definition Selection within the same sex, Genetic Drift Key points Can lead to loss of genetic variation, Change allele frequency Example In population A, there are both blue and green eyes. In population B, there are blue, green, and brown eyes. Gene flow is increased when a blue eyed person from each population switches to the other population, but the allele frequency remains the same, Reduce differences between two populations overtime example 3 individuals from a population with only brown eyes travel to a population with only green eyes. The brown allele is now present in both populations.