I have another "theory". Some stories in the bible are legend and some are historical.
I think the Adam/Eve/Tree legend symbolizes mans evolution into a higher state of intellect. First man was not intellegent, and with evolution of intellegence/ego/choice came more responsibility. One makes an incorrect choice, there is consequence that can effect a good or bad out come, thus the story of right and wrong....
On the other hand:
If one believes in evolution from a type ape, then I can also see how animal instinct in time developed into Homo sapiens intellegence with new higher intellect (ego) now knowing right from wrong, which still needs to be honed in with practice of consequence thus the story again of good and bad.
On the other hand:
And if one believes in the bible account, again, I can still see how it represents the devlopment of ego in humans......who need to learn, with higher intellegence comes consequence.....just like children need to be taught...
As far as Ndrew's explaination....don't know if it is indeed fact.......but sounds good to me....