Genetic Variation from Mutation and Sexual Reproduction
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Genetic variation arises from two sources: mutation, per Unit 6's Bio 1309, which creates new alleles, and sexual reproduction, which reshuffles existing alleles.
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Meiosis's independent assortment and crossing over, per Unit 5's Bio 0961, combine existing alleles into genotypes no parent carried.
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Mutation creates new alleles; sexual reproduction only recombines existing ones — recombination alone cannot generate a new allele.