Question on genetics?

How did I come accross seeds for bubba kush, if its a clone only strain. A hermaphrodite? This has been bothering me for some time now, someone tell me

They are not bubba kush. Just a wild guess.

People back cross them to get them to almost pure Bubba Kush. They will take the BK mother, which is clone only, cross it with a male of some kind.
Then they take the seeds from that cross, grow them out, take the plants that most resemble the Bubba Kush, and breed them back to the mother Bubba Kush plant.
With the seeds from the second cross, they take the plants that are the most like Bubba Kush, and cross them back again.
After doing this a few times, you end up with an almost pure clone only strain. The first cross will be 50/50. The next cross 75/25 and so on until you are almost at 100% bubba kush again. But it will never quite be pure.
I hope this helped some.

Thank you for explaining this to me. The plants these seeds produced look like a pure indica.