A lot of hybrid strains especially alot of the newer american ones hold hermie traits(trainwreck crosses/some of the Og/Chem crosses etc),this is due to the smallness of those cannabis gene pools in general ,,dutch breeders are just as guilty with their feminization techniques,but I have to say that in my opinion it takes bad growing practice or sheer bad luck for these hermie traits to appear,I have grown a fair few feminized seeds,I have only once had 1 hermie on me,and that was cus I heat stressed it,so a lot of it is down to how their lives start, J cervantes says - environmental factors can play a role in sexing a seed (feminized or not), more N = more females less N = more males,more P = more males, less P = less males, so really you want higher N,than P for the first 2 weeks, lower temps with higher humidity = more females, Higher temps less humidity = more males (says to me that if you heat stress plants with hermie traits = male flowers), more blue light = more females,which is why I use a full spectrum LED,keeps them super tight,and I get 2/3rds females most the time, more red = more males, dry soil = more males and less light = more females (bearing in mind most varieties have sativa ancestry even indica so would come from regions with 12/12 or 14/10 10/14 light cycles).