The gapless sequence of the human genome ever produced – but it was missing one small piece: the Y chromosome. Now, the smallest member of the human chromosome family has been fully sequenced, completing a puzzle that's taken three decades to solve. The result is an all-encompassing human reference genome, one that could now contain secrets about male fertility. "Now that we have this 100 percent complete sequence of the Y chromosome, we can identify and explore numerous genetic variations that could be impacting human traits and disease in a way that we weren't able to do before," says Dylan...