Light years?

[gluadys]

Any biology students reading this that can answer what happens when many generations of brothers and sisters mate?

I for one know that the Dalmation race originated from less than 100 dogs and now they have a lot of genetic disorders... Like having only one ball, and being retarded, among other things. So if that happened with 100 different gene pools, imagine what happens with only 2 gene pools.

It would be almost similar to cloning. Everyone is going to have the same alleles for their genes. Even if God created Adam and Eve heterozygous for some traits (e.g. so that between them they would have both brown & blue eyes genotypes), the maximum number of alternatives for any trait is four.

Now whether or not this is bad depends on whether or not any of those alleles decreases fitness.

 

[Robert the Pilegrim]

And where are these bones and houses and ...?

Underwater as people tend to live by the cost, the the flood level didn't go back to the original water line elevation as the waters which were above the firmament remain on the Earths surface.

A billion people?
I doubt a billion people live on the coasts today.

Say a mere 100 million lived inland...