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Confusion over SNP (sole minus & blank) results

Discussion in 'Genetic Testing and SNPs' started by sickntired771, Nov 23, 2014.

  1. sickntired771

    sickntired771

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    Can anyone explain why a few of my SNP's come out with a single minus sign as opposed to the standard -/-, -/+ or +/+? Is a single minus something to be aware of?

    Also, do you guys ignore the -/- because it means nothing is wrong or can that also be a good sign and those should be investigated as well?

    Finally, what about large chunks of blanks for SNP's its like big pieces of missing data. What's that about?
     
  2. Sea

    Sea Senior Member

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    NSW Australia
    If a snp is on the x chromosome a female will have two copies and a male only one, that's usually where you see the single plus or minus where others have two.

    +/+ or -/- is usually not enough info on its own because unfortunately people use those symbols to mean different things.

    Blank snps if you've done recent testing with 23andme would be because they used to test around 960 000 snps and now only test around 600 000
     
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  3. sickntired771

    sickntired771

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    Thank you. Do you know why they dont test as many now? Is there something more comprehensive I should use besides 23&me?
     
  4. Valentijn

    Valentijn Senior Member

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    They used to use an Illumina chip, but now use their own custom chip. The new one is faster, and probably cheaper as well.
     
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