chance of a longest segment being 106.5 cM for a second cousin #dna
Herbert Lazerow
I cannot answer either of your questions; perhaps a professional
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statistician could. It seems to me that the 106.5 is more in the range of first cousins. My two first cousins on MyHeritage and I share longest segments of 82 and 115 cMs, but the total shared in both cases is almost 900cMs. On Family Tree DNA, the same two first cousins measure in slightly lower: 866/61 and 835/108. A third first cousin claims 1108/114. As for second cousins on MyHeritage, they range >from 291/75 to 240/43 [259/40 on FamilyTreeDNA], to 200/21. Second cousins on FamilyTreeDNA are at 259/40, 234/27 and 194/25. I conclude that those six recombinations provide much room for variation, but even granting that, I suspect that 106.5 cMs as a longest shared segment is probably unusual for a second cousin. Of my 5 known second cousins who have tested, none are anywhere near 106.5 cMs. Bert -- Herbert Lazerow lazer@sandiego.edu
My second cousin and I share a longest
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