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This Concept Map, created with IHMC CmapTools, has information related to: Evolution of Populations- Group 1, Evolution of Populations Populations evolve by Genetic Drift, Gene Flow Population, Founder effect Example British colonists who carried the resscive gene for retinitis pigmentosa which is when an individual becomes blind. These individuals moved to an island called Tristan de Cunha. The people who live on this island will more likely have the recessive gene than those people who live on their home land., Natural Selection ???? Sexual Selection, Natural Selection ???? 3 ways Frequwncy Distribution is altered, Sexual Selection ???? Intrasexual Selection, A sudden reduction in population size due to a change in the environment Gene pool no longer be reflective of original population’s gene pool If population remains small, it may be further affected by genetic drift Bottleneck Effect Genetic Drift, Sexual Selection ???? Intersexual Selection, Evolution of Populations Populations evolve by Gene Flow, Evolution of Populations Populations evolve by Natural Selection, Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce ???? Evolution of Populations, Natural Selection ???? Stabalizing Selection, Gene Flow It is most likely to alter allele frequencies directly than a mutation., Variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce Definition of Genetic Drift Genetic Drift, 3 ways Frequwncy Distribution is altered ???? Directional Selection, When the transfer of alleles in or out of the population due to the movement of the fertile indivuduals or their gametes. Barriers can also interrupt the gene flow., 3 ways Frequwncy Distribution is altered ???? Stabalizing Selection, Intersexual Selection Results in Sexual Dimorphism, When the transfer of alleles in or out of the population due to the movement of the fertile indivuduals or their gametes. Due to this populations become more and more similar in their genetics., Adaptive Evolution Can Increase Relative Fitness