Hi Ed,
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There are three relevant processes here:
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(1) Quality controls on individual SNPs. The quality required for variants to be entered on the haplotree is higher than the quality of the variants in the non-matching variants lists. See:
/g/R1b-U106/message/5916
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(2) Manual updates to the haplotree. Additions of haplogroups to the haplotree are a manual process. When a new test result comes in, matching variants like this can be flagged for manual review. If they are of sufficient quality, they can be added to the haplotree as new variants/haplogroups, but this process can take a few weeks.
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(3) Differences in coverage between two tests. The regions of the Y chromosome covered by each test vary slightly. This can mean that two of three testers are called positive for a SNP, but the third tester is neither called positive or negative, meaning the SNP is in an ambiguous place in the haplotree.
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Having looked at your account end entered your position 4736883 into the BigY results BAM viewer, it seems that option (3) is the case here, since it returns no results for this position. Chances are that you also have this SNP and it belongs within the R-FTB93230 haplogroup.
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Cheers,
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Iain.
