Most new alleles arise via

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Most new alleles, or variations of genes, arise from mutations or changes in existing genes. Large rearrangements of genes or changes in DNA polymerase would result in more drastic changes, such as gene duplications or deletions, rather than just new variations of existing genes. Exchanges of genes during crossing over can result in new combinations of alleles, but not necessarily new alleles themselves. Changes in the beginning and ending of a gene can also result in new variations, but this is less common than mutations within the gene itself.

Most New Alleles Arise Via