Re: Y-DNA Warehouse Tree Tech Demo
¿ªÔÆÌåÓýI think it probably varies in every line how quickly snips form, or don¡¯t. After a lot of persuasion I managed to arm twist my closest phylogenetic relative to test with me, to branch out our tree. ? As you can see, our cousins, R-FT74196/BY21620 are producing snips at half the rate of my line R-FT74196/FT13219, and there are 5 private variants between me and the other tester in R-FT74196/FT13219. ? ? At a rate of 52.6 years a would snip form once every 2 to 3 generations. If that were so across the board, we would be seeing a much larger tree, with more branches and leaves. Therefore trying to age snip formation, without lots of comparative data. The problem, I suppose, is that the number of testers, compared to the population at large (particularly from individuals born on the island of Ireland), is utterly insignificant. We¡¯re only scratching at the surface. ? ? ? From: [email protected] <[email protected]>
On Behalf Of Joe Carroll via groups.io
Sent: Monday 6 September 2021 16:50 To: [email protected] Subject: Re: [R1b-CTS4466-Plus] Y-DNA Warehouse Tree Tech Demo ? EXTERNAL EMAIL: This email originated from outside of NUI Galway. Do not open attachments or click on links in the message unless you recognise
the sender's email address and believe the content is safe. ? To all: This time/SNP thing intrigues me greatly (as I assume it does others). Let¡¯s do a little kindergarden math: ? Elizabeth notes that James has?CTS4466 formed 3,000 ybp and its¡¯ TMRCA at 1,700 ybp. ? There are 20 SNPs in the CYS4466 block making the time between forming and the TMRCA yield an average SNP rate of (3000-1700)/20 = 65 yrs/SNP. ? There are two Lee¡¯s near me who, with their 2 private variants, are some 37 SNPs below CTS4466¡¯s TMRCA. If we assume that this takes us all the way to the ¡®present¡¯, then using James¡¯s value of 1700 ybp for that time frame, we get another estimate: 1700/37 = 45.9 yrs/SNP. Of course, the two Lee¡¯s likely do not lead us up to the present; there are more SNPs to be discovered, thus making the ¡¯37¡¯ larger and the yrs/SNP smaller. ? Then if we do these together, we get 3000/57 = 52.6 yrs/SNP. And that¡¯s a max number. So 50 yrs/SNP is perhaps a better guess. ? Comments????? ¡ª joe |