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MICROEVOLUTION chap18 - MICROEVOLUTION CHAPTER 18 SOME KEY...

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MICROEVOLUTION CHAPTER 18
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SOME KEY TERMS DEFINED DNA Gene Allele Genotype Phenotype Homozygote Heterozygote Individual Species Population Gene pool Allele frequency Microevolution
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. Do you ever stop and look at a population of one type of organism? Are they all the same?
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Fig. 18-2f, p.285
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. Sometimes ,members within a population look so different that you can not tell that they belong to the same species. Why are there differences among organisms ? .
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Evolutionary Theories To reveal the connections between organism diversity, connections to the fossil record, and connections to where different organisms are found. Widely used to interpret the past, the present and even to predict the future.
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Hardy and Weinberg Studied the gene pools of sexually reproducing populations. They investigated “Microevolutionary processes” that would change the frequency that genes occur in the “gene pool” of a population. Determined 5 conditions that would have to be met for the gene pool to remain at equilibrium
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Microevolutionary Processes Drive a population away from genetic equilibrium Small-scale changes in allele frequencies brought about by: Natural selection --Mutation Gene flow --Genetic drift Non-random mating
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Variation in Phenotype Each kind of gene in gene pool may have two or more alleles Individuals inherit different allele combinations This leads to variation in phenotype Offspring inherit genes, not phenotypes
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