Visual phasing is a technique developed by Kathy Johnston that allows to assign DNA segments of three full siblings to all their four grandparents by comparing their crossing-over points.

What are the requirements?

  • autosomal DNA raw data files of the three full siblings (or more) uploaded to GEDmatch
  • multiple 2nd or 3rd cousins on several ancestral lines available for comparison
  • Steven Fox’s automated Excel spreadsheet (available for download at the Visual Phasing working group on Facebook)
  • advanced understanding of genetic genealogy
  • analytical skills and patience

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