They chose yeast because a lot of the basic eukaryotic biology is conserved (as compared to humans) and it's basically free to grow more yeast quickly. This mea

They chose yeast because a lot of the basic eukaryotic biology is conserved (as compared to humans) and it's basically free to grow more yeast quickly. This means you can run your experiments super fast. Conversely, the above has resulted in a big number of yeast trained molecular biologists, who end up applying yeast work wherever they can (see: law of the instrument). Sometimes it works, sometimes it doesn't.