Although Dallas and Fort Worth are the ninth and 16th largest cities in the US respectively, the 12 county area that comprises the DFW Metroplex is the fourth largest metropolitan area in the United States (after Chicago, Los Angeles, and New York City) with a population of 6,426,214 according to the 2010 US Census.
All beer is created with yeast, but there are filtration processes that can remove yeast from the final product. All domestic beer in the United States such as Budweiser is yeast-free by law.
Two sets of lager yeast chromosomes are from ale yeast, and two are from this wild Patagonian species. The Patagonian species is what gives lager yeast its interesting cold-tolerant and sulfite-metabolizing characteristics--characteristics that manifest in the distinctive flavor and character of lager beer.