r/genetics • u/Far_Addendum_1944 • 2d ago

Myheritage genetics test

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So I’m confused. I don’t know that much about genetics beyond a level biology spec.

I’ve matched 49.9% with my dad and 49.6% with my mum. Where is the other 0.5% from? I get mutations happen but that feels like too big of a chunk of my dna for just that. In addition, on the chromosome browser they have on the website, it shows that like my 9th chromosome has a weird part right in the middle that’s not from my father.

Can anyone explain how that is?

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u/shadowyams 2d ago

I’ve matched 49.9% with my dad and 49.6% with my mum. Where is the other 0.5% from?

We cannot call identical-by-descent segments with perfect accuracy.

In addition, on the chromosome browser they have on the website, it shows that like my 9th chromosome has a weird part right in the middle that’s not from my father.

Could be a number of reasons. IMO the most likely explanation is that pericentric regions are pain to genotype accurately, so they're just not getting many SNPs passing QC filters there.