Origin point for your specific branch.

General discussions regarding DNA and its uses in genealogy research

Posts: 2152
Joined: Fri Mar 16, 2012 5:43 pm

PostPosted: Mon Nov 06, 2017 10:54 am
From Dr. Iain McDonald
"If you want to pin down the point of origin for a particular clade, you need to focus on the point of migration: i.e. you need to look at the parent clade before the migration, and the child clade after the migration.

You need four things:
* The geographic distribution of the parent clade
* Clear isolation of the location from which the child clade spread
* A good determination of the MRCA date of the parent clade...
* ...and the child clade
The geographical locations determine where the clade moved from and to, and show that this is the point in the tree that the migration took place. The two MRCAs bracket the date of the migration, although normally the migration is found shortly before child MRCA for historical and sampling reasons.

For ethnicity purposes, the limiting factor is generally to work out the date of the migration and the origin of the migration. If we are talking about migration to the British Isles from early historical migrations (Celts, Romans, Saxons, Danes, Vikings, etc.), then this means:
* concentrate on deeper tests fror existing men in the Brittanic sub-clade (BigY, etc.);
* concentrate on sourcing more men from the parent European clade, either from the Y-STR testing pool or de novo testers.

Since absolute and relative numbers of European men has always been our weak point, this is usually our limiting factor. As a result, this project has been directing more of its energies to recruiting and emphasising testing from European men, above more men from the British Isles or its colonies. There are other, more subtle reasons why this makes sense from a modelling point of view too."

- Iain.

Return to General DNA Discussion

Who is online

Users browsing this forum: No registered users and 2 guests