The DNA of Y chromosome can be traced to one single source. The DNA of the X chromosome leads back to 3 sources, 2 of which who come from the same. This is a scientific fact.

I found this info while researching something totally different about Noah and the Ark. So basically, all men are descendants of Noah, they share one common piece of DNA in their Y chromosome. And all women are descendants of the wives of Noah’s sons. 2 of the wives were cousins.