I came across this study while searching for information pertaining to marijuana meiosis. The study, despite the numerous spelling errors, is very informative and addresses / answers many of the very questions asked in the forums. I attempted to attach the report, however it is too large. I hope that this link works for those interested. 206 pages of in depth info.
www.erowid.org/library/books_online/marijuana_chemistry.pdf
www.erowid.org/library/books_online/marijuana_chemistry.pdf