Nathaniel Jeanson has developed his model to support the notion of rapid speciation. For instance using the example of the cat family, start with a pair of proto-cats descending the gang plank of Noah’s ark to begin a new life.
Answers in Genesis, which promotes his work, holds the flood to have occured about 2843 BC, which is later than the most accepted date of the pharaoh Djoser’s step pyramid by a couple of hundred years. Let’s say Egyptology is way wrong and Djoser began building his pyramid the day Noah landed - well I guess that doesn’t make sense either. OK then, lets forget about historical facts altogether and pretend that the pyramids came a couple of hundred years later yet. How does all this relate to Jeanson? Well, the ancient Egyptians were fond of cats, and featured house cats, leopards, lions, and cheetahs in their art, which of course means these existed immediately following the flood. So where did these come from?
According to Jeanson, when Noah took two of every kind on board the Ark, he likely took just two members of each group of creatures that we would today label as part of the same family…For example, all cats large and small—from house cats to lions and tigers—belong to the same family…The cat kind represented on board the Ark probably didn’t look like a mix of every one of these features. Instead, if we identify which features all cats have in common, we begin to form an idea of what the cats on the Ark might have looked like.
Jeanson - Which Animals Were on the Ark with Noah?
Jeanson is seriously suggesting that within a handful of litters, a pair of bland proto-cats gave rise to the various animals depicted in Egyptian art, not to mention the many species of saber-toothed cats, dozens of other extinct cats, and the other existing species. You do not need to be a specialist to recognize this makes N O sense, not to mention that the Bible does not suggest lions and house cats are the same kind. Survey any random group of carpenters, mechanics, stock traders, whatever, and ask if a given pair of cats can yield lions and bob cats within a few generations. You do not need a degree from Harvard or be a graduate biology student to realize this is patent nonsense. Go ahead, try to actually visualize this happening. Similarly, we could add marsupials and lemurs to the discussion.
So when Jeanson wades into the technical weeds of mtDNA, he would have to build a powerful case to sell it as evidence of saber-tooth and house cat siblings. Not surprisingly, as detailed by evograd and others, it falls well short. In this case, common sense and science align. Now if it suits you to find Jeanson’s model convincing, that is fine by me. Just do not be suprised or offended if the academic world has better things to do than to take Jeanson’s model seriously.