Partly human yeast show a common ancestor's lasting legacy -- ScienceDaily
I've been writing about yeast for a while now, and contemplating ideas of yeast apocalypse of varying degrees of seriousness:
a. cosmic ray mutated yeast on board a spaceship or colony becomes particularly well adapted to the human gut, causing nearly all people therein to be continually drunk;
b. genetically engineered yeast to make fake milk goes rampant in the environment and causes thousands of brewers to get obnoxious, cloudy, cheesey beer;
c. genetically engineered yeast to make opiates goes rampant in the environment and gives all home brewers a morphine addiction.
Now, with the story above about how many genes humans and yeast share, I can perhaps go further, and get some sort of yeast/human genetic cross over resulting in the yeast-ification of the human species. Not exactly as exciting as The Fly, I guess; rather more like the original The Thing from Another World. (It was an evolved vegetable, after all.)