What are you talking about exactly? Did you even take highschool biology yet?
The human egg cell gets impregnated by a sperm cell which either has an X or a Y sex chromosome, the egg cell itself has an X sex chromosome usually, sometimes in rare cases it has a Y.
Sperm has a 51% chance of having an X chromosome and a 49% chance of having a Y chromosome usually.
The egg cell has a 99% chance of having an X chromosome usually.
An XX makes a female and an XY makes a male.
Sometimes people are born with two Y chromosomes in rare cases and they are usually very violent and manly and dominant when that happens and they actually have a higher chance of going to prison than normal men.
The fertilization IS impregnation OP, story short I suggest taking a class about this stuff or just looking it up online instead of asking us such a simple question.
