Very interesting thread - I am learning from the learned! Thanks for the
enlightenment!

Langdon Hagen-Long wrote:

"Only in the late 19th century, when some scientific studies appeared
showing conditions such as insanity might be caused by close
intermarriage, did the law forbid marriage between relatives, such as 1st
cousins, or Uncle/niece.  [Insanity was found later not to be caused by
cousins marrying]"

My question is [as someone with enough understanding of basic genetics to
be dangerous] how/when was the risk of insanity found not to be increased
by the potential joining of recessive genes through close intermarriage?

I await more enlightenment.

Thank you

Larry A. Whinery
A family buff in Indiana

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