sparkey
Great Adventurer
- Messages
- 2,250
- Reaction score
- 352
- Points
- 0
- Location
- California
- Ethnic group
- 3/4 Colonial American, 1/8 Cornish, 1/8 Welsh
- Y-DNA haplogroup
- I2c1 PF3892+ (Swiss)
- mtDNA haplogroup
- U4a (Cornish)
If you need a clear example of a geographic barrier to gene flow, here it is.
R1b frequency in the Balkans.
Not a great map, Eupedia's is better:
Notice that there's something preventing gene flow in Bosna and Dalmatian coast.
No, you're misinterpreting frequency again. There is no reason to assume that the lack of R1b in certain areas of the Balkans is the result of R1b never being in those areas of the Balkans. It could very well be that other haplogroups expanded at R1b's expense in those areas.