The phrase "duplication events" refers to instances in which certain genes or segments of DNA are copied, resulting in additional or extra copies of that genetic material in an organism's genome. Full definition
This whole genome duplication event probably occurred in the ancestor to all angiosperms, about 240 million years ago, the Amborella Genome Project reports today in Science. (sciencemag.org)
These fish have two distinct copies of the SWS2 gene — SWS2A and SWS2B, which arose from an ancient gene duplication event 198 million years ago in the ancestor of all spiny - finned fish. (sciencedaily.com)
Rather than supporting a genome duplication event at the time when yeast evolved to have twice the number of chromosomes, their data indicated that the duplicated genes had begun to diverge long before. (sciencedaily.com)