Artley, de Harcla, Harclay, Hardclay, Hardeley, Hartel, Hartelay, Hartely, Harthelay, Hartle, Hartlee, Hartley, Hatley, Hertel, Hertelay, Herteley, Hertle, Hertlee, Hertley, Hurtley
This Project is aimed at those who have the surname HARTLEY, to enable members to research DNA linked to that surname.
HARTLEY Family Tree Genealogy Group on Facebook: https://www.facebook.com/groups/hartleyfamily/
The HARTLEY Family Surname Genealogy Project: http://hartleyfamily.org.uk/
The HARTLEY Surname Project at FTDNA: http://www.familytreedna.com/public/hartley/?iframe=ydna
HARTLEY Surname DNA Project - Yahoo Group: http://groups.yahoo.com/group.hartleyDNA
An updated R1b-Tree can be seen at: http://www.isogg.org/tree/ISOGG_HapgrpR.html
A haplogroup is a group of descendant individuals from a single founder who all share a common SNP mutation. Individuals can test for these SNPs to determine their haplogroup assignment, which is often reflective of distant geographic ancestry. Membership in a particular haplogroup thus indicates broad population and geographic ancestry while other mutations in descendant haplotypes can reflect recent genealogical ancestry.
A SNP (single nucleotide polymorphism) is a variation in DNA sequence between individuals involving a difference at a single base-pair. SNPs generally have lower mutation rates than STRs and are often sufficiently stable to robustly define haplogroups.
"Private" SNPs on the Y chromosome correspond to relatively recent mutations that have not yet been observed in a significant number of other individuals in the same haplogroup. Some of these will eventually be incorporated into the Y-tree with further research. Others may provide clues about recent genealogical ancestry.
STR (short tandem repeats) are a type of molecular marker consisting of short DNA letter repeats (such as CACA). These markers have a high rate of mutation and are accordingly useful in determining population genetic differences. In the Y chromosome line, SNPs and STRs in conjunction serve to show differences between individuals and groups in their DNA lineages. In short, STRs are one part of the puzzle in everyone's Y chromosome DNA heritage.
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