I hope many of you also caught this interesting doco , if not you can view episode 1,2, http://www.abc.net.au/iview/#/docs
Tracing the history of just 4 plants, the apple, potato, marajuana and tulip - the importance of planting a variety of within species to produce better crops naturally!
Couldn't help but think how it also relates to animals. I've always preferred mutts over pedigrees - less likely to suffer breed specific problems and less attitude!

Cheers