Please allow me to share a little light on this subject for
Supreme Court Judge, Ketanji Brown Jackson,
and all other stupid or confused people in the world. 
The 23rd pair of human chromosomes specifies a person’s biological sex. Known as THE SEX CHROMOSOMES,
this pair consists of: either two X chromosomes (XX) for females or one X and one Y chromosome (XY) for males.
-XX Sheila Tolley-