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It deserves mentioning that while STR lengths may have to be non-zero, in at least one instance a STR is “reported” as zero. Mentioned in a presentation by Thomas Krahn (

Razib Kahn's commentary. https://www.razibkhan.com/p/the-genetic-origin-of-the-indo-europeans ?

Preprint from the Reich lab. https://www.biorxiv.org/content/10.1101/2024.04.17.589597v1? ( https://www.biorxiv.org/content/10.1101/2024.04.17.589597v1?utm_source=substack&utm_medium=email )

Hi Richard, ? The recombinations that Thomas Hunt Morgan discusses on the autosomes don't apply to the male-specific Y chromosome, because it doesn't recombine. For the autosomal DNA, I'll leave that

Thank you for the interesting clarification, which explains the thinking of the STR years. Is there any theoretical and/or empirical reason to suppose that the location and combination of these

Hi folks, ? Mike's comments are spot on, but I thought I'd try to be a bit more pedantic *ahem* precise in the reasoning. ? The reason people appear and disappear from match lists at different

What Jason said is right, this can happen that we "have matches that disappear at 1 level before reappearing at another" Ian noted too that "If you don't have any matches beyond Y-12 and Y-25, then

Hi Dado, all, ? It's not so much a mistake, but it is misleading. If you take an individual person to whom you are related and no mutations have occurred in your first 25 markers to separate you,

The Law of Large Numbers applies to Y STR testing. The more STR markers tested the better. I quote FTDNA. "As the marker level increases, the time frame becomes more narrow, and the test becomes more

Greetings, Thanks everyone for the answers. I was a bit confused because FTDNA shows that with people who are an exact match on Y25 I have a common ancestor born between 1400-1950, most likely around

Actually, this is really why BigY (and sequencing tests in general) are so important - because they remove this ambiguity of descent: as long as you have at least one SNP mutation that defines a

Hi folks, ? A few replies/comments to messages... ? The idea behind the Y-STR genetic-distance-based matching criteria at FTDNA are that you should have about a 50% probability of matching any one

I'll take the bait. Genetic distances can't be "misleading" or "mistaken" (unless there is an arithmetic error). ?They are an objective measurement, whether calculated using Y-STRs or Y-SNPs. It is

Our Project’s recent experience illustrates how Y-STRs can be misleading in predicting the branch of a family to which a new participant belongs, even at the 700 marker level. The 18-year-old Acree

i wish. I have 478 matches at Y12, 15 matches at Y25, and one at Y37. I upgraded to Y67 and then Y111 but still one match. I have 4 Big Y matches, three of which are negative for my penultimate

Yes that's an interesting way of looking at it. As I am sure we all have matches that disappear at 1 level before reappearing at another. So many of these 12 might not show at 25 and 37 but could

For the most part, you will hear that 25 marker matches are not relevant. Out of my 109, 5 of them are not relevant. However, the 104 that are hold their relevance out to 37,67,111 or Big Y, whatever

Jason, You might want to read Roberta Estes regarding Bennett Greenspan's thoughts about Y12 Bennett Greenspan: Meet My Extended Family & Discover Extraordinary Deep

I won't see this as I am already tested to the 111 marker level and I am about 3 weeks behind you on the big y as only upgraded to that on the 20th March. I too only show as m269. What I do know was

Cheers, yesterday I got new results, which come before Big Y. At 111, 67 and 37 I don't have a single match, at 25 I have 655, of which 4 exact matches and a lot of 1 step genetic distance. Earlier, I