There were 4 men including Noah on the Ark three of which were Noah’s sons. These son’s would each have 1/2 of genes from Mom and 1/2 genes from Noah.
The descendants after the flood from Noah’s children would contain 1/2 of his genes and 1/2 of mom’s genes.
I’m not aware if Noah or wife had children after the flood.
Noah’s 3 children came with 3 wives, so their children would have been distinctly different from their cousins. There were about 9 generations between Adam and Noah, so the gene mix of the wives could have been very different by Noah’s generation.
In summary, the descendants of Noah children would have had three distinct sets of genes from which the nations flowed. Noah is not likely the common denominator.
True enough, Raycpa. I’m not suggesting that Noah’s lineages would all have survived. I’m just suggesting that anyone prior to Noah could not have been the genetic Adam.