[realpatriot71]

Even if there was a flood, there were eight humans and two chimps on that boat. What would explain the greater genetic diversity from the smaller gene pool evolving over the same time period?

[Gladwin]

7 of the 8 humans didn't have any children?

[Sabertooth]

Even if there was a flood, there were eight humans and two chimps on that boat. What would explain the greater genetic diversity from the smaller gene pool evolving over the same time period?

The humans were all from the same family, except perhaps, the wives (although incest prohibitions didn't come until later). If the chimps weren't, that would explain it.

[Rushian]

Because of the decreased life expectancy of the chimp, there have numerous more generations, and each generation offers the chance for diversity. They were only twice as diverse, so would have only needed twice the number of generations.