You will find more variety from a f2 line compared to F1 this means male or female from F2 can, and usually is a elite
An F1 seed variety is created by breeding together two pure strains. For example, a tall plant (represented with two dominant genes, AA) is bred with a small plant (represented by the two small recessive genes, aa). Since the resulting plants will each receive one gene from each parent, this will result in offspring with the following genetic make-up: Aa. All four offspring will have the same make-up and therefore, will each be tall plants. The difference from the parent generation in this case is that these will not be pure strains due to the presence of the recessive (short) gene.
To create what is known as an F2 strain, the grower will breed two members of the F1 family together. The 'children' that result from this breeding will have the genetic make-up of: AA, Aa, AA, and aa. This is illustrated in the table below
This means that the F2 seed strain will have three tall plants and one short plant. So, the main difference between the F1 and F2 varieties is the amount of genetic variation and purity of the seed strain.
this is where the breeder will sort out what he wants to move forwards with such a variation breeders like stank bro and other top end breeders spend years going through generations looking for that special one the comes out
https://books.google.ca/books?id=SHT1BwAAQBAJ&pg=PA5&lpg=PA5&dq=why do you get more variation from F2 strains then F1&source=bl&ots=yV8YwYgopH&sig=8yl7I_XIJ_iUZc-88EUMOaQHXtQ&hl=en&sa=X&ved=0CEsQ6AEwBmoVChMI3rLIndvyyAIVDjOICh1SmAKu#v=onepage&q=why do you get more variation from F2 strains then F1&f=false