Hi, slevesque
slevesque writes:
I skimmed through it though, but found no reference to the minimum 10k age you are referring to. In your previous post, you said you calculated a 15k mininum a couple years back, is those two references one and the same ?
Those figures are from me. In the discussion, they put the figure for the four surveys (including Parsons') combined at 14 mutations for 1221 transmission events. Worked out relative to Parsons' time estimate, this gives you 15, 800 yrs.
The Icelandic survey on its own will give you a whopping 42,300 yrs.
sleve writes:
the paper says this in it's conclusion:
"We have argued that several of the explanations posited for a
systematic difference between phylogenetic and pedigree estimates of mutation rates are more limited than they might first appear to be. Pedigree estimates of this mutation rate are unbiased, regardless of the heterogeneity in ratesor of mutational hot spotsin the CR."
Doesn't this a bit contradict your claim on plausible explanations of the difference between pedigree and phylogeny-based estimates ?
No. What they're saying is that pedigree estimates are unbiased in determining the mutation
rate, with which I agree.
But if you go on and read the rest carefully, you can see that they agree that the rate is unlikely to be a good indicator of what remains in the population long term, because of heterogeneity, which they say "undoubtedly exists".
For my purposes here, that doesn't matter, in the sense that we're talking about what the minimum age of the mtDNA Eve could be without considering the factors like heterogeneity, selection and drift (which would all make her older).
In other words, I'm rigging it to your advantage as a YEC, and pointing out that if those surveys were the only data you had to go on, because of the 15,800yr figure, you would say that the earth is very unlikely to be less than 10,000 yrs old, because that would require a 37% margin of error in your favour.
slevesque writes:
While searching for that paper on the creation.com database, I found this article:
http://creation.com/...imp-human-dna-similarity-not-any-more
Which as a reference to the paper, but claims (if you read the relevant part of the article) that this paper in fact supports an age of 6500 years old.
I'm not a geneticist, like you seem to be, so maybe you could enlighten me on how you calculated your minimum age and how Dr. Dewitt could have gotten his 6,5k figure.
You're making my point for me here. Dr. DeWitt says:
quote:
A number of studies have demonstrated a remarkable similarity in the nuclear DNA and mtDNA among modern humans. In fact, the DNA sequences for all people are so similar that scientists generally conclude that there is a ‘recent single origin for modern humans, with general replacement of archaic populations.’8 To be fair, the estimates for a date of a ‘most recent common ancestor’ (MRCA) by evolutionists has this ‘recent single origin’ about 100,000—200,000 years ago, which is not recent by creationist standards. These estimates have been based on comparisons with chimpanzees and the assumption of a chimp/human common ancestor approximately 5 million years ago. In contrast, studies that have used pedigrees or generational mtDNA comparisons (6), (9), (10) have yielded a much more recent MRCAeven 6,500 years!(10).
He lists three papers, but that's all he says about them, and the "even 6,500 years" can only be passing reference to the Parsons paper, yet he misleadingly puts the (10) reference after it! Sin of omission. He could have done some maths, and said "from 6,500 years to 42,325 years". He also omits to mention heterogeneity, selection possibilities etc.
He appears to know his audience. They won't look at details, and won't understand what's going on.
sleve writes:
bluegenes writes:
There's also DNA data on regional stone age people compared to the modern inhabitants that would blow out that view.
You talking about Neanderthals ?
No. I mean us. If you're one of the YECs who considers Neanderthals to be descendents of Adam and Eve, then the sequencing of their DNA is an even bigger problem for you, as it would put the age of the earth way back, even at the Parsons mutation rate.
What I was referring to is samples of DNA taken from specimens like the oldest complete skeleton found on this island (9,200 years by our dating, but for you, he must be post-flood).
There are people in this region today in the same specific mtDNA haplogroup. Not much change. But a big change from people in the middle-east, and ancient skeletons in North America, for example.
sleve writes:
The date you talk about is your own calculation from their data. Dewitt seems to have calculated a different date from the same data. How can I know who's right ?
Read the paper carefully, and do the maths yourself.