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Evolution of Genes

Natural Selection, Point Mutations In Existing Genes, Alleles, Gene Duplication, Gene Families, Pseudogenes

Individual genes and whole genomes change over time. Indeed, evolution of genes ultimately accounts for the evolution of organisms that is seen in the fossil record: Humans evolved from earlier apes, and those creatures from their ancestors, by gene changes in the earlier creatures. Just as the fossil record can be examined to understand the patterns of organismic evolution, so too can genes be compared to understand genomic evolution.

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Medicine EncyclopediaGenetics in Medicine - Part 2