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Theory of Evolution > Variation
Variation is introduced by a number of processes:
- Mutation - These create new alleles and thus a new characteristic.
- Gene duplication produces new genes.
- Recombination, Crossing Over - This creates a new set of genes in meiosis by creating a haploid (single set of chromosomes) cell by mixing the genes from the original diploid cell.
- Sexual reproduction - Combines gametes that may carry different alleles never before found in that combination.
- Gene flow, migration, Horizontal transfer - Transfers genes between isolated gene pools.
The product of variation is then subject to selection.
This page is part of the EvoWiki encyclopedia of genetics and molecular biology.