chapter 23 - Population Genetics Individuals of a...

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Population Genetics Individuals of a population have the same number and kinds of genes In a population, a gene may exist in different forms Microevolution means that changes have occurred in a population’s allele frequencies Allele frequencies can change through mutations, gene flow, genetic drift, nonrandom mating, and natural selection Individuals don’t evolve, populations do Population Polymorphism: traits come in two or more distinct forms, ex: snakes Gene pool – pool of genetic resources, shared by all members of population o At a given gene locus only 2 possible combinations on one individual but in a population many combinations possible The Hardy Weinberg Theorem The frequences of alleles in the gene pool will remain constant unless acted by other agents o Gene freq should add up to one o P^2, q^2, qp x 2 Theroretical state in which a population is not evolving To have same gene pool - ONLY IF: o No mutation o Very large population o Isolated from other populations o No selection ( not all the individuals have the chance to reproduce or
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chapter 23 - Population Genetics Individuals of a...

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