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Thread: One-to-one matches cM vs #SNPs

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    One-to-one matches cM vs #SNPs

    So I'm curious. When someone does one-to-one matching, at least on GEDmatch, you get the matches listing how long the segment is in cM and how many SNPs there were in that segment. I get the idea that those two are roughly related but that it varies depending on the chromosome and I guess even along a chromosome. So when you are looking at more distant matches where these numbers get smaller, is there any rule of thumb for which number is a better indicator that a match is IBD as opposed to IBC?

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