00:01
So we have two possibilities that are commonly found.
00:05
You can have either 2x chromosomes or 1x, 1y.
00:09
And we're looking at 2x chromosomes.
00:14
And so they inherit one of each from each parent, because you inherit one of any chromosome from each parent.
00:25
So there must be the mother who had 2x chromosomes, and the father who had 1x, 1 y.
00:31
So you can see the inheritance here.
00:34
It could have been either of the x, but you always get this single x chromosome from a father.
00:41
Which of a woman's grandparents could not be the source of any of the genes on either x chromosome? so we have the mother's mother, the mother's father, the father's mother, or the father's mother, or the father's father.
01:00
Okay, so let's go back a generation...