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My question still stands unless Im missing something FB. How can the feminization process *(forcing reliable strains to produce male flowers) effect its progenies dna that controls its likliness to produce male flowers?
it doesnt - really it's all about selection of the parents whether you are making regular seeds or fem. proper selection processes take time and this is a corner that often gets cut in the drive to get a strain onto the market and make money from it.
i suspect one reason why fems have the reputation for herms might be that they are often understandably the choice for new growers who havent got their growing environment properly dialed in and stabilized.
NFR - my best mother plant is 2 years old now (DP Blueberry) and is fine. if you are having problems with mums trying to flower it may be that your lights arent very strong - my regular powerplant mum trys to flower under week flouro lights. also when plants get rootbound this can trigger flowering. check out the 'bonsai mums' thread to see how to root prune and renovate mother plants.
cheers
VG