I'm guessing crossing of genes can always go two directions, that's the reason that (un)stable hybrids like
Liberty haze can give two phenotypes. One is bulky and the other one is mostly sativa and stretches more
and reacts different on the feed you give to both the pheno's.
Liberty haze is a cross between G13 haze which is 80% sativa and Chemdawg 91 which is a 50% hybrid.
Crossing two feminized seeds can no way give a regular seed in my opinion because of the genes.
A feminized seed is XX, a male XY.
If you cross a XX and XX you can never get a XY.
About the photoperiod that i'm not so sure what that'll do.
An autoflower is crossed with a ruderalis to get the trait.
Let's say ruderalis is present of around 25% in one of the parents.
Than you get XX/XX crossed with XX/XY, for example. So that way it's around 25% autoflower and 75 % photoperiod.