[lumberjim]

Yes. But. You're describing combinations and statistial variation. If the X coming from mom was there from her creation, then no change that occurs to her during her life will alter the actual egg, so to whatever extent her genes carry to the fetus, they were there from the start. Unchanged. Unless the eggs can change. Maybe they can, I don't know. Not so concerned with varying combinations of x and y. But externally influenced changes.

Like if, as a 20 year old, I do an inordinate amount of lsd, and it changes the way my mind works, can that transmit through my sperm and my kids would have some residual effect? But their mom already had her eggs done, so if she did just as much acid, would it even matter?
The x that comes from the fathers mother could be changed, but only while the father carried it.