Your mother got an X-chromosome from both her parents. You got one of them so it is a 50% shot that your X-chromosome was your maternal grandfathers. Your maternal uncles got their X-chromosome from your maternal grandmother so that is the other X-chromosome you had a 50% shot receiving from your mother. Every maternal uncles has a 50% chance of having the same X-chromosome as your mother had a 50% chance of passing on to you. So each uncle has a 25% chance of sharing your X-chromosome. Your mother shares the X-chromosome that your maternal uncles have but also could pass that X-chromosome rather than your maternal grandfathers X-chromosome. So you know your mother has your maternal grandfathers X-chromosome and there is a 50% chance she shares your maternal grandmother's X-chromosome with your maternal uncles. Your maternal uncles is a place to look for possible expression of your X-chromosomes recessive characteristics but they may not even share the X-chromosome your mother got from your maternal grandmother.
So to sum up the odds you share your X-chromosome with your maternal grandfather is 50%. The odds you got your X-chromosome from your maternal grandmother is 50%. The odds your mother got the same X-chromosome as a maternal uncle did from your maternal grandmother is 50%. The odds you share your X-chromosome with a maternal uncle is 25%. The places to see your X-chromosomes recessive characteristics expressed is any male maternal blood relative but the most likely to share your X-chromosome is your maternal grandfather.
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