First, your proposal doesn't make sense in terms of the creationist story you're telling. You're saying that while humans were degenerating, accumulating deleterious mutations and suffering dramatically shortened lifespans, their mutation rate was improving? And not just improving, but getting much, much better? Even if we allow that the long-lived guys had higher mutation rates because of lifespan (paternal mutation rates increase with age), mutation rates still had to have decreased by about a factor of ten since then. That's not consistent with the rest of your story.
We still have to determine what the actual mutation rate is/was..will be. You haven't shown what you presented to be correct.
You are judging my model on information that hasn't been shown to be correct. Because of that...you question is based upon info that doesn't appear as valid.
I really don't have to go any further than your opening statement....Subject a fetus to radiation and the quickly forming cells can have a much higher mutation rate.Second, there's no physical mechanism by which this could happen.
Third, we have independent evidence for the age of the mutations we're talking about. That evidence comes from associations between nearby genetic variants (technical term, "linkage disequilibrium"). When a new mutation occurs, the new variant appears on a particular chromosome having a particular set of other variants. It will be passed on to future generations along with those variants, unless recombination during meiosis breaks up the chromosome and combines it with a different one. But recombination only occurs about once every 80 million basepairs per generation, so the associations break down slowly. Recent mutations, then, will appear on long unbroken segments of chromosome, while older mutations will be on short segments. We thus have a good idea what recent mutations should look like. The mutation that confers lactose tolerance on many Europeans, for example, sits on a largely unbroken segment of DNA that is over a million basepairs long. Conveniently, we happen to know when that mutation spread in the European population, because researchers have tracked its rise in DNA samples from ancient skeletons: it became common around 4500 years ago. That's around the end of the time when -57's high mutation rate was contributing lots of mutations. If we look at 1% mutations throughout the genome, we find them on unbroken segments that are only 100,000 basepairs long, one tenth the length of the lactose mutation. 5% mutations are on even shorter segments, half as long again. Thus, the bulk of the genetic variants we see in the 1% - 5% range are at least 10 to 20 times older (in generations) than 4500 years ago. (That's actually a lower bound for complicated reasons I won't go into.)
Your applying old earth time scales to your position. This position hasn't been demonstrated to be correct.
You're also assuming your mutation rate is correct. People and bacteria have diffferent mutation rate and can't be directly correlated. Your model says that they can...and hasn't been demonstrated to be true.
Fourth, the processes that lead to new mutations in the next generation also produce the mutations that give us cancer. If people live long enough today, pretty much everyone gets cancer eventually, since the dangerous mutations continue to accumulate the longer you live. If mutation rates were really, say, 70 times higher per generation a few thousand years ago, then essentially everyone would have gotten cancer while still young. If anything, those enormously long life spans back then would have required a much lower mutation rate than we have so they could avoid cancer that long; instead, it's being proposed that their mutation rate was much higher than ours. Given that mutation rate, most of them would have been dead of cancer by age 20.
Once again you're basing your argument upon unproven speculation and assertions of what the rates were.
I will add that this kind of approach is pretty typical of creationists' engagement with scientific data. Where a scientist will try to find an explanation that explains new data in a way that's consistent with all existing data -- since that's the best way of figuring out what's really going on -- creationists will make ad hoc proposals in an effort to make inconvenient data go away.
Seems as if you're trying to use fallible science to show the bible as wrong.
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