i have had the experience where a Y chromosome did seem to appear out of thin air
a female plant that had the strong intersex trait, and was very much self fertile
i don't believe that it could have been pollinated by another plant, i grow one at a time
can't prove that though
discussed this on an ic thread/site, got a lot of interesting feedback
one of which was how did i know my plant wasn't a self fertile male?
the only rebuttal was DJ Short says they're rare
but reflecting on it, how do we know that many of the plants we call shemales aren't self fertile males?
not many grows have genetic analysis done on them