GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2013-03 > 1364044859
From: Ann Turner <>
Subject: Re: [DNA] AncestryDNA updates
Date: Sat, 23 Mar 2013 06:20:59 -0700
Yes, chromosome 24 is the Y. I have fewer SNPs with calls, though, just 14.
These are presumably places where the probe picks up a short sequence
located somewhere else in the genome. 23andMe probably does some
post-processing to give no-calls. I wonder if I got no-calls (coded as
zero) for more of your Y SNPs at Ancestry. Here's my list:
Chromosome 25 is for XY SNPs, where the SNP is also found on the
pseudo-autosomal regions (PAR) at the tips of the Y. 23andMe groups those
with the X.
On Sat, Mar 23, 2013 at 5:16 AM, Debbie Kennett <>wrote:
> If I've done my copying and pasting correctly I seem to have 701,478 SNPs
> my AncestryDNA raw data file. For some reason which I cannot understand I
> have information on 25 chromosomes.
> There are 17604 SNPs on chromosome 23
> There are 885 SNPs on chromosome 24
> There are 440 SNPs on chromosome 25
> For chromosome 24 I have zeros for 792 of the SNPs, but I have As, Cs, Ts
> and Gs reported for the remaining 93 SNPs. I presume chromosome 23 is the
> X-chromosome. I presume chromosome 24 is the Y-chromosome but if so I don't
> understand why I don't have a full set of zeros. And what is chromosome 25?
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