Paleopolyploidy is extensively studied in plant lineages. It has been found that almost all flowering plants have undergone at least one round of genome duplication at some point during their evolutionary history. Ancient genome duplications are also found in the early ancestor of vertebrates (which includes the human lineage) near the origin of the bony fishes, and another in the stem lineage of teleost fishes. Evidence suggests that baker's yeast ("Saccharomyces cerevisiae"), which has a compact genome, experienced polyploidization during its evolutionary history.