Here is a fun National Public Radio Podcast we ran across:

Different types of beers — ales, stouts, etc — are distinguished primarily by their yeast, but now these groupings might get even more complicated. Scientists have examined the genetic sequences of 17 unique lager yeast strains from breweries in Europe and North America, tracing variations in their genetic code back through time.

Guest:

Gavin Sherlock, assistant professor of genetics at the Stanford University School of Medicine

Listen Now [17 min 49 sec]