Visual phasing
From ISOGG Wiki
Visual phasing is a methodology for assigning segments to specific grandparents based on the crossover points of three siblings. This technique can be employed when parents are not available for testing. The methodology was developed by ISOGG member Kathy Johnston. The details of the methodology can be downloaded in a PDF file from the FTDNA Forums (registered users only).
Contents
Blog posts
The methodology has been demonstrated by a number of genetic genealogists in a series of blog posts:
- The use of crossover lines to determine segment matches with grandparents among siblings — visual phasing. by Jason Lee, DNA Genealogy, 20 January 2016
- My big fat chromosome 20 by Joel Hartley
- Chromosome mapping with siblings – part 1 by Ann Raymont, DNA Sleuth, 13 May 2016
- Chromosome mapping with siblings – part 2 by Ann Raymont, DNA Sleuth, 1 June 2016
- Visual phasing: an example (Part 1 of 5) by Blaine Bettinger, The Genetic Genealogist, 21 November 2016
- Visual phasing: an example (Part 2 of 5) by Blaine Bettinger, The Genetic Genealogist, 22 November 2016
- Visual phasing: an example (Part 3 of 5) by Blaine Bettinger, The Genetic Genealogist, 25 November 2016
- Visual phasing: an example (Part 4 of 5) by Blaine Bettinger, The Genetic Genealogist, 26 November 2016
- Visual phasing: an example (Part 5 of 5) by Blaine Bettinger, The Genetic Genealogist, 27 November 2016
- Visual phasing compendium A PDF file with a compendium of Blaine Bettinger's five blog posts.
Videos
- Visual Phasing of chromosome 20 using Excel A video at YouTube showing visual phasing in Excel, by Lars Martin