- Aug 30, 2012
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What you are arguing for would only further reduce your model's prediction of the amount of human genetic diversity present today, and your model already forces a dramatic underestimation for the amount of diversity present today.It is possible to create a viable population of any animal by starting with a genetically perfect breeding pair with a large potential for variation & a long life span. Birth defects occur when both the male parent & female parent have a mutation or genetic mistake in the same loci/allele & it is expressed in the offspring. In genetically pure parents like Adam & Eve, who live several centuries & had many children, mutations would accumulate very slowly & so the likelihood of any of these "mistakes" being expressed in the genome of their offspring is lower. One parent's gene is likely to mask the other.
"Natural selection" only reduces diversity in the case of catastrophic die offs, which is not normally referred to as "natural" selection.Genetic diversity in the species is not eliminated unless natural selection occurs.
Disease would be a problem, not for them but for *us*. Even if Adam, Eve & Noah were all superhuman and invulnerable, which I think is a comic book superman model of Adam & Eve, you still have the problem that disease would be an overwhelming problem for us today if we all descended from just six people 5,000 years ago.For instance, the pygmy tribes in Africa have only very small people because they were isolated. But if 1 of their members were to mate with say, a tall European, the offspring have a great potential for diversity. Also, in Adam & Eve's time, disease was not a problem. Weather conditions were better with more moisture & less UV light penetrating the ozone, longer life spans, different living conditions & healthier diets.
You people keep changing the subject back to Adam & Eve's disease resistance. It is like you folks are wired to misread this because it is much easier to slide the subject from present to past than it is to deal with this issue in the present. It suggests to me that y'all are stuck in the past.
What the OP is actually about is what *our* disease resistance would be like *today* if we all came from six people just 5,000 years ago. If that were so the human race would be even more susceptible to extinction than cheetahs. There is no way that a disease could come along and kill 90% of a population (Indians and small pox) or 50% (Europeans and bubonic plague). If a disease were deadly enough to kill one previously healthy person, it would kill 100%, total extinction. There would be no in-between, no partial population kills in epidemics.
But on the plus side, if we were all descended from just six people only 5,000 years ago we would all be so closely related that huge numbers of people would be compatible organ donors. There would be a far shorter waiting time for people who need transplants. Just as any cheetah can accept a skin graft from any other cheetah without provoking an immune response.
Why does the fact that cheetahs originated before the bottleneck change the comparison between the cheetah bottleneck 10,000 years ago (which actually happened) and the proposed human bottleneck 5,000 years ago (for which there is not a shred of evidence)? Your theory that 5,000 years ago was the origin of our species does not alter the fact that it would still be a bottleneck that would make us all FAR more closely related to each other than we actually are, with no possiblity for there being different races.A population bottleneck in cheetahs is an absolutely different issue. A bottleneck does not speak about the origin of cheetahs in the 1st place.
Less genetic enthropy could not possibly produce greater diversity, it would produce precisely the opposite, even less genetic diversity. Natual selection on the other hand does not reduce diversity, only catastrophic dies-offs do. So none of the things you mention here actually reduce or increase diversity in the manner that you seem to think.And the cheetahs that were left to repopulate may have had very little genetic diversity due to genetic entropy over time & the forces of natural selection.
If cheetahs are more diverse then why don't they have races? (Before 10,000 years ago they did).Cheetahs cannot be used to measure the diversity in humans. Human beings are also extremely closely related. We differ by no more than 0.02% of our DNA.
Good point, which even further reduces the amount of genetic diversity that could possibly exist today. You are just digging your hole deeper.NB: Creationists do not propose a genetic bottleneck 6000 years ago. They propose the creation of Adam & Eve. A bottleneck is what occured at the time of Noah's flood with 3 couples to repopulate (Noah's sons).
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