Diwana,
Marrying with a cousin once in a while is fine but** marrying generation after generation after generation will OBVIOUSLY lead to problems.**
Not true. Not proven by scientific methods. You said OBVIOUSLY...and that's where you are absolutely not correct.
If the genes are present only then cousins marriages may bring genetic defects.
If bad genes are not present then even hundreds of generations will not bring genetically defected offsprings.
Did you read the articles by the way?
It is not the cousin marriage it is the genes.
And cousin marriages can even bring stronger offspring or even negate bad genes.
First cousin marriages may be problem in minority of cases and additional risk aboveand beyond non-cousin marriages is up to 2.8 percent. This is similar to or even less than the risk in a woman having a child around age 40.
Second cousin marriages still not more problematic than general population or random marriage.
Interestingly, conceiving a child at or around 40 years is not unlawful.
Canada, and whole Europe and many many other countries in this world have no law against cousin marriage. Only in some states of USA.
20% of ALL marriages in the world are cousin marriages. That is one in five marriages around the world!
If it was true that birth defects were so strongly associated to cousin marriages then we would have lot more people with genetic diseases due to cousin marriages alone.
Lastly, what about genetic defects so much prevalent in non-cousin marriages?
X-linked diseases do not require cousins marriages to be manifested for example. And what about so much more common autosomal dominant diseases? They do not require cousin marriages. Ever heard of Hemohilia or Fabry's disease?
Someone cited Pakistani area with genetic diseases.
The question is, where is the proof that it is due to cousin marriages and not because of disease already prevalent in the close family members and would be there anyway even if there was no cousin marriage???
Well if that is the case, then cousin marriages should not be done just like any other marriages!
Another thing you must know is Ashkenazic Jews have prevalence of several genetic diseases. Based on race and not necessarily marriage pattern by itself. Their forefathers had it, they just carried along. Hence there may be some race based diseases in these Pakistani individuals.
Just remember, we all are off-springs of cousin marriages at one time in the history of mankind!
Keep shrugging away. It helps your shoulder muscles! ;)
Speaking of shoulder muscles...read about Duchene muscular dystrophy-it does not need cousin marriage.