seeds sexing time?

Hi, i just planted my seeds for 1st time. I was wondering after how many time i can know what sex are my seeds. Also is there something like ratio what they will become male/female or its fully random.

Another question on not this topic: When they can start breading eachother *if there is male and female in 1 container/room*

You will know the sex of the plants you start from seed, after you flip the lights to 12/12. You may get a clue of what sex they are, by the growth rate. Males tend to grow taller, faster. There is no way to identify a male seed from a female seed which does, in fact, make it random as of which sex it will become.

As for breeding, I usually wait until about the 5th week of flower to introduce the male pollen. It's just how I do it and it works so I can't really tell you the why part.