GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2010-03 > 1268418826
Subject: Re: [DNA] Question about matches on Chromo #7 at 23andme RF
Date: Fri, 12 Mar 2010 13:33:46 -0500
> Wouldn't it make more sense to report them in a way that
> them - like Chr #1A and Chr #1B?
Yes, it is too bad the technology only permits an alphabet soup to be
reported. Each SNP position is reported in alphabetical order. A
no-match occurs when both chromosomes from two individuals have a
no-match at a position.
This is a purely hypothetical example in the region you mentioned:
count 15 positions
1. CT AA TT CC CC CC AA GG AA CC CC TT GG CC CC
2. CT AA TT CC CC CC AA AG AC CT CC TT GG CC CC
3. CT AA TT CC CC CC AA AA CC TT CT TT GG CT CT
Person number 1 half-matches person number 2
Person number 2 half-matches person number 3
But Person number 1 does not half-match person 3
It helps to compare the raw data to understand the results.