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Y-DNA Haplogroups & SNPs Basics This forum is for those new to personal ancestry testing on the direct paternal line with Y-DNA SNP tests. All may view this forum, but you must register and sign in to post.

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Old 7th January 2018, 09:24 AM
Quinny71 Quinny71 is offline
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Family Finder and Y-DNA Matching

This is a basic question that I should probably know the answer to, but don't. Could/would somebody that is pretty closely related to me via Y-DNA testing (GD=2 over 67 markers) also show up as a autosomal match under the Family Finder testing, matching on a chromosome(s) other than the Y-chromosome?
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Old 7th January 2018, 10:43 AM
John McCoy John McCoy is offline
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Autosomal testing (such as Family Finder) is very good at detecting close relationships, out to about third cousins (although the rule of thumb is that about 10 percent of actual third cousins probably won't be detected as matches from autosomal DNA). Beyond third cousins, the percent of actual relatives that are not detected as matches goes way up -- around 50% for fourth cousins. So, yes, a Y-DNA match could show up also as an autosomal match, if the relationship is not too distant. However, Y-DNA usually mutates very slowly, so you would expect the Y chromosomes of third cousins related through common patrilineal descent, for example (they would share a common great-great-grandfather), to be nearly identical.
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Old 7th January 2018, 12:14 PM
MoberlyDrake MoberlyDrake is offline
mtDNA: T2b5 | Y-DNA: J-M172
 
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First, the match would have to have done both tests. Most Y-DNA matches, even if they have done Family Finder, won't show up because the relationship is too distant. If you do find one who shows up on both, it's worth getting in touch and comparing trees, though I think about 9 out of 10 people these days don't have trees and couldn't care less.
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Old 7th January 2018, 12:28 PM
msc_44 msc_44 is offline
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Quote:
Originally Posted by Quinny71 View Post
This is a basic question that I should probably know the answer to, but don't. Could/would somebody that is pretty closely related to me via Y-DNA testing (GD=2 over 67 markers) also show up as a autosomal match under the Family Finder testing, matching on a chromosome(s) other than the Y-chromosome?
yes they can and I have these matches
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Old 7th January 2018, 03:23 PM
TwiddlingThumbs TwiddlingThumbs is offline
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Could? Definitely. Would? Not necessarily -- it depends on the factors that McCoy and Moberly mention in their posts.
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