Do plants from seed need any darkness to show sex?

I have ten 3 week old plants that have been under a 400 watt mh 24/7. Do I need to give them a few hours of darkness to show sex or will they show after 4 weeks no matter what?

Thx

18/6 what's that lol.... just kidding.

I haven't grown from seed in 5 years. I forgot if the lil guys need dark to show sex or not.

So you say no dark. We will see in a week or so. Thx for reply

they will show sex when they are mature enough on their own without any darkness, it will most likely be more than 4 weeks before you get to that stage however

When your plant is 7 nodes high look between the 6-7 node for signs of sex
Also I prefer to give them 18/6 because the roots need complete darkness to relax and get set to go again. Hmmm something like that, I stones of some Diesel and I know I read it in the bible below.

put your plants to 12/12 and you should see sex in about 2 weeks.

I heard, but not tested, if you don't want to 12/12 your plant, take a small cutting and 12/12 that beast, same sex as the parent.

Also, I wouldent think growing from seed or clone or any means other than those would make the plant act differently.