On some threads in some of the forums on sites like 23 and me that do DNA research there are children that all had their DNA and haplogroups ran and stories of how some didn't know how much their mom 'slept around' until they found out they each had different daddy's and others even worse of those that discovered they were the product of a brother and sister relationship kept secret in their family, and lets see, others of mothers not being their mother but their aunt and that kind of thing. If one were educated in some things about genetics and passed on traits I suppose early warning signs would be there but you know on that subject it always sounded to me like Noah was the product of a nomadic wanderer likely with red or sandy blond hair and blue eyes based on the stories and we know Genghis Khan was a hybrid and that his name means "Gray Eyes".
Apparently Genghis was a hybrid, that is to say mixed breed, chastised on both sides of his family and berated as a lesser man which led him to be forced to his own area with the other "Gray eyes" of which he gathered together and then reproduced throughout his empire. In the genome projects he is the single biggest contributor to our human gene pool with no other coming close. The nearest after is far down in millions of people that descend from him and is the O'Neill family of Ireland and Gaelic fame. Nial of the Nine Hostages apparently fathered a great great many children also but nothing compared to Genghis.
It is interesting that the role racism plays in shaping and directing human diversity. I found this greatly revealing. Will someone embed this if I screw it up please. :-) thanks. https://www.youtube.com/watch?v=kh9cVieelzg&t=234s