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| Description: Table 17.1 Sources of Variation in Traits Among Individuals of a Species Genetic Event Effect Mutation Source of new alleles Crossing over Introduces new combinations at meiosis | of alleles into chromosomes Independent Mixes maternal and assortment at paternal chromosomes meiosis | Fertilization Combines alleles from two parents Changes in Transposition, duplication, or chromosome loss of chromosomes number or structure
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