Cannabis Genetics: Sativa, Indica and Hemp is there a difference?

Cannabis Science Podcast

There is an ever-growing list of names for all these seemingly specific strains and plant varieties. But if I asked you to tell me what the chemical profile, type, and origin for OG Kush bought in my neighborhood dispensary was, would you be able to tell me? Cannabis enthusiasts often suggests that there are different plant sub-species, the most common being Sativa, Indica, and Hemp. But is this true or are they simply varieties of the same species? Thanks to recent advances in genetic testing Dr. Rivera and crew get to the bottom of the truth behind this often-misunderstood topic.
Additional information and references:
https://cannabisconciencia.org/
http://www.coopradio.org/