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apriha / lineage

tools for genetic genealogy and the analysis of consumer DNA test results

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Absence of Y chromosome match between confirmed father and son

damblef opened this issue · comments

commented

Hi,

I have noticed using various 23andme files that the software does not yield any results for the Y-chromosome when comparing father and sons. The X matches with the mother but the Y does not with the father. These are for confirmed genetic relationships. cM thresholds used where 0.75 and 7.

Any idea why this is happening?

commented

Thanks for the question. Currently, no matches are reported for the Y chromosome because most of the Y chromosome does not recombine and there is no genetic map for this. See https://www.ncbi.nlm.nih.gov/pubmed/11237016 .

But I agree that there should be some means to show if the Y chromosome is shared. Perhaps a simple threshold of almost all Y chromosome SNPs matching to start...