The inheritance patterns for the X chromosome for males and females is different.† Men inherit only one X chromosome, from their mother, while women inherit two Xs, one from their mother and one from their father.† In turn, their parents inherited their X in a specific way as well.† All ancestors donít contribute to the X chromosome. See this link for a really decent primer on X-DNA.
The chart below shows how I (and my brothers, my father) inherit X-DNA.† You can see it only comes via specific ancestors.† So those are the lines to explore if we have an X-DNA match.
X-Match for John McGing
This is what an X-DNA inheritance line looks like for my sisters and my mom.† There are of course a lot more lines where the X-DNA can come from but there are ones where it canít.† By looking at the X-DNA between siblings, it can be possible to determine if a match is on momís side, dadís side or maybe they share a common ancestor and what lines to ignore.
X-Match for Maureen McGing Dunn
Last updated March 27, 2018