Elizabeth (CORMACK) RENFRO – A Nice, Big X Match (Ancestor 45)
If you’ve been studying genetic genealogy for a bit, you may understand X DNA, but I’ll give a summation here.
X DNA is different from regular autosomal DNA. The 23rd chromosomal pair contains the sex chromosomes – those which determine the biological gender of the child. In all but rare cases, biological females have two X chromosomes (XX), and biological males have one X and one Y (XY). As we may have learned in high school or college biology, it is the male’s 23rd chromosome that determines the gender of the child.