Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130211074649/@comment-3580035-20130211110015

If you learnt genetics, you will know that you don't necessarily need a Blank to reproduce to produce another Blank. It's possible to have part of the genetic sequence to make a Blank in your DNA, and through a chance compatibility with someone else who has the other part of the genetic sequence, a Blank can be born from two non-Blanks.