What causes a huge chunk of chromosome 6 to be inherited from only one parent? I was doing one-to-one comparisons on GEDmatch and noticed that this is the only location where a significant "block" was inherited from one parent. It looks like the same locations. I got the "block" from my father and my brother got the "block" from my mother.

Is this just coincidence? Is it HLA related? I know my brother and I have different HLAs. Mine is found often in Siberia and Native Americans but in 3-5% frequencies in W Europe. Is it a coincidence that my father and I both show exactly 3% Finnish and my brother shows 0%?

How many SNPs are the HLA types? I know HLA-DRB are "minor" ones but useful for grouping. How about the main HLA types of A,B,C?

Me vs Father
Chr6m2d.jpg

Me vs Mother
Chr6m2m.jpg

Brother vs Father
Chr6b2d.jpg

Brother vs Mother
Chr6b2m.jpg