are you sure it is not YOU who is new to growing, dude?
boricuaboi, i checked a couple of articles you link. thanks for them. but i didn't see anything new in them i haven't read before. like many, i too, read any and everything i could get my hands on before i began growing.
a cannabis plant, from seed, will be one of the two sexes. with chemical treatment, and possibly with eviromental stress, you can help it influence a plant.
people have written some findings here. vidoeman40 has a thread with temps and humidity and such that will help to get females. but it's not foolproof unless you use chemicals.
however, even though the plant hasn't shown sex before you flower it, it is already one sex or the other. if you clone a male plant in veg that just hasn't shown sex yet, it's clone will be male. it's that simple.
true, each seed carries the genetic information of the other sex. it is possible to chemically treat it so that it reverses sex. i myself would never try this. it's possible, but surely one of your seedlings will be female.
i think you might be better off not stressing the plants to get them to change sex.