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it definitely has to be genetic, as you can see a clean break straight down the center of the leaf, perhaps expressing different levels of chlorophyll-producing enzymes or something along those lines.
i wouldn't worry about it, but keep the pictures coming as it looks to be happening in more of the younger leaves
-------------------- "Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." - Abraham Lincoln
"There are a thousand hacking at the branches of evil to one who is striking at the root" ~ Henry D. Thoreau Strike The Root
I was given the seeds and was told they were a Sativa dom stain Daydream. I grew them out and near the end of flowering one of the plants that was stressed turned hermaphroditic and pollinated some of the others. This a an F2 feminized (w/ hermy tendencies) group that I wanted to test out. So yes this mutation could very well be genetic. I ended up not going through with this grow for parania reasons.