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Old 29th October 2017, 02:03 PM
alice alice is offline
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Join Date: Jun 2015
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Understanding x-match

I am baffled by the match described below. Please, can someone with a better understanding of the x-chromosome help me?

F and M are the father and mother, respectively, of Daughter 1 (D1) and Daughter 2 (D2).

F and his children have a fairly strong autosomal match (38 cM in one segment) with Cousin (C).

M and C have no autosomal or x match.

F and C have no x match.

From triangulation it is clear that the match between F and C is on F's father's side, not his mother's.

Yet, D1 and D2 both show x matches of the same 7.9 cM segment with C. How is this possible, since the x that F passed on to his children was from his mother?

Thanks a lot.
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