Gene duplication (or chromosomal duplication or gene amplification) is any duplication of a region of DNA that contains a gene; it may occur as an error in homologous recombination, a retrotransposition event, or duplication of an entire chromosome.
Gene duplication (or chromosomal duplication or gene amplification) is any duplication of a region of DNA. This duplication of a region of DNA contains a gene. It may occur as an error in homologous recombination. It may occur as an error in a retrotransposition event. It may occur as an error in duplication of an entire chromosome.