I found an answer for one of my questions "Sometimes a female plant contains male flowers, its rare but it happens. The male flowers on a female plant contain the same chromosomes as the female plant itself (X-X). This means that the Female plant can fertilise itself and can grow seeds that can only contain Female Chromosomes and thus grow female plants." But I still can't figure out how you can be sure you're getting a cloned female during the veg stage.