In most cases, the female is XX and the male is XY. Every individual must have at least one X chromosome. Since the female is XX, each of her eggs has a single X chromosome. The male, being XY, can generate two types of sperm: half bear the X chromosome, half the Y.
There are people born with both sexes, penis & vagina, or vagina with balls that don’t descend, or ovaries and a penis. It’s like any other birth defects that can happen. Then there are chromosomes and hormones that can be messed up more y’s than Xes or whatever. Unlike what Mike Johnson says about god making a man and women. Grow up
This makes up less than .02 percent of the population, don’t make blanket policies to accommodate a microscopic part of the population. You make exceptions to policy to handle that.
The point is they do exist, and Jackson was correct to say, "I can’t answer that question I’m not a biologist, and Mike Johnson saying god made a man and woman, along with Bears are full of shit.