Some really great info on both sides about bagseed.
Bottom line its an unknown.
But the unknown can lead to the greatest strain in the world THE O.G. -
The legend has been told that it was a single seed in a bag of weed bought at a Dead show that started the strain. A good story. But hears the closest to the truth I have heard outside of the horses mouth:
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http://www.thcfarmer.com/forums/f53/history-chemdawg-family-4461/)
History of the Chemdawg Family
At a Grateful Dead show at Deer Creek Amphitheatre, 'joebrand' (aka 'wonkanobe') and 'pbud' met 'chemdog' and sold him an ounce of very high quality pot for $500. joe and chemdog exchanged numbers and they later arranged for two ounces to be shipped to chemdog on the east coast. According to chemdog, one ounce was seedless and the other had 13 seeds.
In 91, chemdog popped the first 4 seeds. From these seeds, one male was found and disposed of (chemdog was young, you cant blame him). The 3 females were labeled chemdawg (now 91 chemdawg), chemdawg a (now chemdawgs sister), and chemdawg b. In '01, chemdog and his girlfriend attempted to germ 3 more seeds, labeled c, d, and e. the e seed never germinated, c turned out to be junk (according to chemdog), and chemdawg d was the keeper. In '06, 'chemdog' and 'joebrand' reunited and joe was given 4 of the last 6 beans: Chemdawg phenos 1-4, '4' being the chosen keeper. Joe thought the '4' was the best representation of the original and thus dubbed it the 'reunion pheno'. Chemdog still has two seeds left in his stash.
Chemdawg Crosses:
'OG Kush' (the original cut) came from an s1 from in a bag of '91 Chemdawg in the Lake Tahoe area in 1996.
'Sour Diesel' aka ECSD came from an accidental cross of ('91 Chemdawg x Mass Super Skunk/NL)x DNL after the DNL hermed and seeded the room. The DNL's lineage is NL/Shiva x Hawaiian.
Original Diesel' (also known as Diesel #1, Headband, Daywrecker Diesel, Underdawg) came from a cross of '91 Chemdawg x (Mass Super Skunk x Sensi's Northern Lights) done by a guy known as weasel.
So as you can see its all about the UNKNOWN.
And the best thing about bagseed... they are FREE !!!