E. Such a 'plateau' threshold would require this first human to have a mate with an identical chromosomal makeup- which is possible only if she is cloned from him.
You may be aware that humans have 23 pairs of chromosomes and that our closest living relatives, the bonobos, have 24 pairs. These two species are not thought to be interfertile. But were you aware that the domestic horse has 33 pairs, that Przewalski's horse has 32 pairs, and that the two are perfectly able to breed fertile offspring? The Przewalski's horse is near extinction because of crossbreeding with domestic horses. And no cloning was involved anywhere......
"Spirit." I think that term applies to something that high-school cheerleaders are supposed to possess. I certainly lost what little I had when we lost to our arch-rival Rogers in 1964.