Genome evolution is change in the sequence, content and organization of genomes across generations. Mutation, gene duplication, deletion, genetic recombination and natural selection can change both individual sites and large regions. A duplicated gene can retain its original function, acquire a new role or lose function. Comparing related genomes helps distinguish these histories, but the history of one gene need not match the history of the whole species. [ref]
New to topics? Read the docs here!