01-13-2012, 11:25 PM
[quote name='G.Subramaniam' date='14 November 2010 - 08:58 PM' timestamp='1289748028' post='109235']
There are indeed bad effects of in-breeding
Marrying a 1st cousin decreases IQ by 8, a niece by 15 and a sister by 30 points
Extrapolating , marrying a cousins daughter would decrease IQ by 4 and marrying a second cousin by 2 IQ points
So one could say that all inbreeding effects are negated if the genetic distance is at least 2nd cousin.
In the pre-scientific age, this could be the initial basis of ban on same gotra marriages
In the following posts, I will post more
[/quote]
Guru-ji, one query. While we assume that this could be the initial basis for the ban on the same gotra marriages, what could be the possible ways/methods or reasons by which the ancients of the yore observed the above phenomenon (if at all they were basing it on this)? Or did they observed it over generations and concluded thus? To put it in simple words, we did not have any genetic mapping/modelling at that time to come to such conclusions. What then, led to formation of these customs/rules? I hope I've conveyed what I wanted to put across.
There are indeed bad effects of in-breeding
Marrying a 1st cousin decreases IQ by 8, a niece by 15 and a sister by 30 points
Extrapolating , marrying a cousins daughter would decrease IQ by 4 and marrying a second cousin by 2 IQ points
So one could say that all inbreeding effects are negated if the genetic distance is at least 2nd cousin.
In the pre-scientific age, this could be the initial basis of ban on same gotra marriages
In the following posts, I will post more
[/quote]
Guru-ji, one query. While we assume that this could be the initial basis for the ban on the same gotra marriages, what could be the possible ways/methods or reasons by which the ancients of the yore observed the above phenomenon (if at all they were basing it on this)? Or did they observed it over generations and concluded thus? To put it in simple words, we did not have any genetic mapping/modelling at that time to come to such conclusions. What then, led to formation of these customs/rules? I hope I've conveyed what I wanted to put across.