Results 1 to 3 of 3

Thread: Gedmatch phased kit vs unphased kit and probability of IBD?

  1. #1
    Registered Users
    Posts
    489
    Sex
    Location
    USA
    Nationality
    USA
    Y-DNA (P)
    R-U152
    mtDNA (M)
    H2a2a1

    Canada Quebec United Kingdom Ireland Finland

    Gedmatch phased kit vs unphased kit and probability of IBD?

    I've had the opportunity to check my Gedmatch kit against someone who has their phased. The majority of matching segments remain mostly unchanged between the two. Now, what I want to know is if anyone has worked out how the probability of a match being IBD vs match length in cM (or SNPs) changes when using a phased kit. I'm thinking something similar to what I believe I saw on the ISOGG website.

  2. #2
    Registered Users
    Posts
    452
    Sex

    I've done some experiments with HRC 1.1 imputation and phasing; other people may be phased against both parents which would be the only way to get proper phasing. And of course then there's DNA.Land phased kits. So the answer will depend somewhat on which phasing is in question. I don't think the probabilities people have been calculating take phasing into account at all though; beyond certain cM match length it starts to become a non-issue, and the matches below that segment are likely background sharing in population anyway. It's an interesting question to explore, though.

  3. The Following User Says Thank You to Donwulff For This Useful Post:

     therrien.joel (10-22-2017)

  4. #3
    Registered Users
    Posts
    489
    Sex
    Location
    USA
    Nationality
    USA
    Y-DNA (P)
    R-U152
    mtDNA (M)
    H2a2a1

    Canada Quebec United Kingdom Ireland Finland
    Yes, in this case I was referring to parental phasing.

Similar Threads

  1. Replies: 24
    Last Post: 06-09-2019, 10:18 PM
  2. Replies: 0
    Last Post: 12-19-2017, 09:21 PM
  3. Phased kit question (Gedmatch)
    By firemonkey in forum Autosomal (auDNA)
    Replies: 3
    Last Post: 08-27-2017, 11:48 PM
  4. GEDMATCH phased kits have few matches
    By wombatofthenorth in forum Genealogy
    Replies: 7
    Last Post: 07-20-2016, 11:45 PM
  5. Gedmatch phased data??? How to use?
    By favouriteslave in forum Autosomal (auDNA)
    Replies: 2
    Last Post: 12-02-2013, 01:16 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •