This is the modern science that supports my thesis A Possible History of Life on Mars

http://www.dailygalaxy.com/my_weblog/2008/05/will-scientists.html

the claim that "moving a human nucleus into an empty animal egg"
would result in something 99.95 human has to be wrong, because
the mitochondrial DNA in the egg, outside the nucleus, is as much
if not more as the nuclear DNA and we don't know exactly what it
does.

I think that this happened before The Flood and the results, some
of them, were offworld when The Flood hit, and the aliens we see
now are their descendants.