(part 1)
Not bothering me at all man, I'm interested in this sort of stuff myself.
These stuff are online, but in this day and age the vast majority of discourse regarding Iran is political and even an issue as simple as this becomes complicated. Also the Iranian regime doesn't like to spend much time on these matters for obvious reasons (every country is responsible for advertising its own history and when our regime neglicts this, the end result is simple).
Iranians are almost identical in their genetic make up. In the most polar extremes of the country, there are variations. For example people up North have more European features, but down south, less. But it's not enough to be able to distinguish. Also, Reza Shah destroyed tribalism back in the early 20th century.