Visual Phasing Chromosome Selection Matrix - Recombination Project Update
By Andy Lee I love logic puzzles and DNA is definitely full of logical puzzles. After reviewing DNA recombinations from my own project, I have developed a chart that helps me understand my grandparent's DNA through Visual Phasing. Visual Phasing is an advanced technique for genetic genealogists where the results from siblings, can be used to determine part of the genetic makeup of grandparents. This technique was developed separately by Kathy Johnston and Randy Whited around 2015. There is a Visual Phasing Working Group on Facebook that is run by Blaine Bettinger if you want to learn more specifics about the technique. 1. You need the DNA results of at least 3 full siblings. If you only have 2 siblings or if you have 2 full siblings and a half-sibling it is a lot more difficult. From these siblings, you are mapping out where recombination points happened. 2. Go through and assign segments to generic grandparents, as far as possible. 3. Use other close relative matches to re