Supposedly, it's a mutation that gives you purple eyes at puberty, no hair, and for women, fertility without menstruations.
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The origins appear to be invented in some fan fiction. There's no reference to it in Google Scholar, which covers abstracts from a huge number of scientific papers.
Cameron Miquelon claims to be the original author in about 1998, and is frustrated by people who can't tell the difference between fiction and fact:
Alas, what’s truly astonishing is that in spite of this post’s existence (as well as the true origin of Alexandria’s Genesis being a Daria fan fiction website), nothing has changed among the 99 percent of you who believe that what I wrote is truth, if my bookmarked Tumblr search tag is anything to go by.
For that, I hate you all so very much.
Anyway, there you have it: Alexandria’s Genesis is simply a bad mashup of Daria, Art Bell, Twilight, witchcraft and Cylon skinjobs adopted by New Agers and others who should know better, but don’t and won’t.