What I am trying to say is that your thesis has a basis, but not a primary contributor to the present borders in my view. The genetic effect exists as a spectrum and it is difficult to decide on a cut-off value to it, especially in Punjab. The more direct contributor is probably religious. Though one may argue that it acted similar to the genetic component (probably low-correlation) in its effect, in my view it had the greater effect. We could step back to look at the effect and assign a broader umbrella term of Identity as to how and why it happened this way. Identity would encompass the social, geographic, religious, & genetic factors. Then we could put forth our idea as to which factor predominated.
So true .
1. When Pakistan was created 70 yrs back and not 1600 years back , East pakistan/Bangladesh was part of it .
2. It was primary and solely based along the religious line , that's why you see most of Punjabi and Sindhi Hindus and Sikhs of west pakistan are now living in India after being evicted from their native places of time that goes far beyond 1600 years .
Don't just throw up names . It means nothing .This is the Ram Krishna Mission translation, by Nikhilananda....
The word used in garbha sanskar " Soumya " which means radiant in sankrit and not fair complexioned .