What will be the gender if X and Y combine?

Answer 1

In the genetic system.

XX is the female and XY is the male.

There are four ways this can combine

X"X' & XY as

X"X Female

X'X Female

X"Y Male

X'Y Male

The are dashes on the 'X's' for clarity of combination.

This results in an equal number of females and males being born.

Answer 2

Males are of genotype XY (where X and Y chromosomes combine). Females are of genotype XX (where 2 X-chromosomes combine).