jar
# the only humans left were seven (or eight) members of one family.
# there were only two (or four depending on whether the number is of individuals or pairs) of unclean critters.
# there was either 2 (or four see above) or 7 (or fourteen see above) of clean critters.
# all the other animal life was killed off.
Based on those factors, what should be seen in the genetic record?
A complete extinction of the survivors since no new plant food source could possibly be grown in time to feed said animals. Indeed what is not often mentioned is that there were no vegetation or trees brought on board,nor flowering plants nor mushrooms.
Soil would be incapable of supporting vegetation so farming is completely out the door. I would say a slow death by starvation for the non meat eaters initially followed by starvation of the predators after they ate all of the survivors.
I always wondered where the dove would have found an olive leaf to bring back to the ark. Since the soil could not possibly have been suitable for the growth of a plant after all life forms had been destroyed not to mention the ruining of the soil from the "flood".