...were yeast ( Saccharomyces cerevisiae ), a nematode worm ( Caenorhabditis elegans ), and a fruitfly ( Drosophila melanogaster ). The yeast , containing ∼12 million bp, is only
0.4% the length of the 3-billion-bp human , and the worm and fly s are ∼3.3% and 5.5% the length of the human , respectively...