There are several ways to make fem seeds. The one you are referring to I believe is antiquated. Greenhouse seeds claim the chance of getting a male is about 1/1000. So using that logic, every 1000 fem seeds they send to people contains a male.I am a newby at pot growing, but humor me.
I thought that in order to get fem seeds, you need to have pollen from a herm bud or a reversed male or female...and those resulting seeds carry only the X chromosome, then pollinated with the XX of the female.......?
How can they produce a male? Other than maybe changing gender completely.
A little stoned so I hope I made sense.