I was starting at the top of my DNA matches from GEDmatch and after 30 matches I have matches on 13 of 22 chromosome, so I thought I'd see what the X chromosome looked like. So I started at the top and the first three were pretty regular, Lots of red, some yellow and a bit of green. I then got to my known half 3rd cousin once removed and lo and behold except for a tiny bit at the beginning and a even tinier section at the very end, there was no yellow at all. Most of the chromosome was green with a fair amount of red. So what's going on? Our last common ancestor is George Washington Conrad and on my side it goes Female, Male, Female, Male. On my cousin's side it goes Female, Female, Male Male Male.
So is this an error by GEDmatch, or Ancestry.comDNA or a genetic variation which prevents the Xs from crossing over or chance or what? His kit ID is A441738