Board Thread:Warhammer 40k General Discussion/@comment-7699236-20150618150629/@comment-2253300-20150621224118

Some of you guys seem to be misunderstanding the concept. Females suffer severe rejection when implanted with Gene-seed. This is very well supported by the lore. It is physically impossible to make Female Space Marines because Gene-seed is keyed specifically to be compatible only with males. In order for female Space Marines to become a reality GW would have to retcon the lore. Also Imperfist is right. Gene-seed manipulation prettyu much never goes correctly. The genetic sciences behind the creation of Gene-seed, and their manipulation are so advanced that nobody save the Emperor, and maybe Fabius Bile, understands it. It's why you have to grow more Gene-seed from existing samples, and can't simply whip some up from scratch. It's also why Chaos Marines often have to raid loyalists for more Gene-seed since theirs eventually becomes too unstable to use.