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Family Finder Advanced Topics Advanced discussion about Family Tree DNA's Family Finder Product. |
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Segment Matches with Grandparents Using Crossover Lines
Many have asked for some suggestions for strategies used in the visual phasing of grandparents when parents are deceased. I put together a step-by-step PDF file from a PowerPoint presentation. It utilizes crossover points derived from comparisons through GEDmatch. I can explain each step once the slides load. I have permission from this family to discuss the results. The ultimate goal is to show matching between siblings and each set of grandparents for one chromosome.
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Kathy, once again you have been extremely helpful with my understanding of phasing.
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I will soon have the results back from my four full siblings to add to mine, giving me an excellent opportunity to try out this process.
I have a couple of questions, though. Each chromosome has two halves, but GEDmatch supplies only a single line of commonality. Consider the simplest situation, where siblings A and B match one side of a chromosome exactly, and they have one break-point on the other side. Will GEDmatch show that they match 100% on the entire chromosome, or will the break-point be visible? If the break-point is visible, how would I know that the opposite side is a complete match? |
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thank you
Thank you, Kathy. These will be a great help in trying to explain this to others.
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