At about the 4th week of veg, you should begin looking at the main nodes of the plant. Initially it will be difficult to tell, but by the 6th week you should know for sure,and if male, get them the hell out of there.
MALE: a male will have a protrusion at the node that is reminiscient to a human thumb. It will be like a stub that grows more in width than length. From this little nub seeds will form when flowering begins...this is not what you want if you are trying to attain a mother plant!
FEMALE: instead of nubs at the nodes, two hairs that will maintain a constant width will grown in length after thet form. They will be reminiscient of tentacles of which are long and thin. Again, initially it will be hard to tell, but by the 6th week you should know for sure.
MOTHER PLANT: To determine which plant to use as a mother plant to attain clones, simply do so by first ruling out all males. Secondly, you should choose a plant that has plenty of healthy available clones (an available, usable clone will be a stem that is about 2-3 main nodes down, and has about 2-4 small cotyledons on it). The mother plant should be the female plant that is healthiest, has grown the longest, and has the most available stems to turn into clones
TO CLONE: snip off the stem after the 2-3 main nodes and some cotyledons with a 45 degree angle across the stem...be sure to use a brand new fresh razor. After you snip it off, split the end of the stem vertically about a half inch up the stem...in other words, begin to cut the stem in half longways from the bottom, and go about a half inch up...after you have cut this, cut the two lowest nodes of cotyledons from the bottom off to increase surface area that the cloning gel adheres to. The most important aspect to remember to get it to root is that the more surface area you make, the more possibility for root growth. After the cuts, IMMEDIATELY place the exposed cut end of the stem into a cup of water to maintain viable life. Then all you have to do is apply the gel, place them in your growing medium, place a hood over the clones and maintain a humidity of AT LEAST 85% or more!!! This is imperative because the leaves will be unable to get water because their is no root system initially...until the roots form, which could be up to 2 weeks, tedious care needs to be taken to maintain a high humid. level. Remember to use flourescent lights because they generate little heat and clones should be at about 75 degrees, which can be tough in the summer. ANY MORE QUESTIONS?