uk666 5,298 Report post Posted April 16, 2019 Chromosomes, a beginner's guide Chromosomes, a beginner's guide: XY = Male XX = Female YYY = Delilah XXXX = beer (YYY = Delilah. why why why Delilah is a Tom Jones song.) (XXXX (pronounced four-ex) is a brand of Australian beer.) Share this post Link to post Share on other sites