variation that shows gradations - continuous, variation in discrete categories - discontinuous, variation caused by the environment - non-heritable, competition between different species - interspecific, competition among members of the same species - intraspecific, the struggle to survive - selection pressure, the type of gene - allele, number of individuals of a particular species - population, all the alleles in a population - gene pool, the relative proportion of alleles in a population - allele frequency, A way of calculating allele frequency - Hardy-Weinburg, The change in allele frequency over time - Genetic drift,

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