The Gros Michel (aka Big Mike) banana was once the primary banana export around the world. Because the banana is a seedless. hybrid, every Big Mike plant was cultivated as a clone. In the 1950s a fungus began infecting farms and, spreading amazingly fast, it nearly wiped out the industry. Today's banana is a different variety (which they say does not taste as good!). Why was the entire Big Mike variety so susceptible to this fungus?