BIOLOGY 1M03 Study Guide - Genetic Variation, Color Vision, In Essence

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Natural selection is not the only process that causes evolution. There are four mechanisms that shift allele frequencies in populations. Increases frequency of certain alleles, the ones that contribute to success in survival and reproduction. Genetic drift: causes alleles frequencies to change randomly. In some cases, drift may even cause alleles that decrease fitness to increase in frequency. Mutation: modifies allele frequencies by continually introducing new alleles, alleles created by mutation may be beneficial or detrimental or have no effect on fitness. Analyzing change in allele frequencies: the hardy-weinberg principle. To study how four evolutionary processes affect populations, g. h. hardy and wilhelm. Weinberg developed a mathematic-al model to analyze the consequences of matings among all individuals in a population. At the time it was commonly believed that changes in allele frequency occurred simply as a result of sexual reproduction (meiosis followed by the random fusion of gametes) to form offspring.

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