1) IF the San woman had a daughter...however, the Fact, Not IF genetic testing shows that Jamaicans who are Black test up to 75% English DNA. Again the mitochondrial DNA.
I think you are confusing different things.
What explicitly does your source say about mtDNA and 75% English DNA?
Black Jamaicans absolutely will have a mix of African, Native American and European DNA because that's their ancestry... but mtDNA doesn't mix, it just gets passed on, so it's matter of their female lines being expressed, which I imagine would be mostly African and Native American, but there would certainly be other examples.
2) The horses are a combination of all different divergent breeds. However after 500 years of feral, the horses are phenotypes strongly indicative of their respective mitochondrial DNA. Revert to Type
Except that mtDNA doesn't create revert to type, that's not how it works. It doesn't revert, and it doesn't even define type.
3) The fact remains that a disease seriously disadvantageous to survival of the species cannot be naturally selected out of the species.
Why not?
Each generation people with the negative traits will be statistically less likely to pass it on.
It's not about whether Frank Jones who lost his sight at 41 does or does not have children, it's about whether all the families related to Frank over the generations have more issues and overall less children because of the excessive blind family members.
4) Neandertal MtDNA...If a Human Male mated with a Female Neandertal, then the resulting offspring would have Neandertal MtDNA.
Yes... what's your point? According to your statement, which I have no particular reason to dispute, there is no evidence of an unbroken female line back to pure Neanderthals.
5) Humans share some DNA with Neandertals...and Mice..(not me though, I don't like cheese)
All humans share DNA with mice because we are all related to them in the same way.
Some humans have more Neanderthal DNA then others because we have more recent interbreeding then the development of humanity.
The technology that demonstrates this is the exact technology that demonstrates paternity.
And I was just getting started on the "inconvenient truths" of evolution...
You really aren't.
I research subjects carefully. I don't assume, based on some biology class I took years ago as some poster do. In fact, not so old biology books state that Neandertals and Peking man are co-equal multipoint origin, mostly discredited idea although the Chinese political/university machine is trying to resurrect that by making the Peking Man older and therefore Ancestor to Neandertal. Ancestor is superior in China.
Your comments seem to have some fundamental misunderstandings about how genetics work.
Older doesn't imply ancestral.
Peking man is a variety of Homo erectus a species unambiguously older then Homo sapiens and Homo neanderthalensis... but they weren't necessarily ancestral to those species, more an second uncle to Sapiens and Neanderthal's cousins.
In fact in the ancient past there were at least five varieties of human living at the same time:
Homo sapiens
Homo neanderthalensis
Denisova hominins
Homo erectus
Homo floresiensis