causes of variation arised
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Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring)
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The two main sources of genetic variation are mutations and re combinations of genes as a result of sexual reproduction. A mutation is a permanent change in the DNA within a gene
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