Chromosomally speaking, what do you know about sex? Take a quiz to find out.
![Floating letters X and Y to represent chromosomes, coming together to form chromosome configurations XX and XY against a background of rotating double helixes.](https://www.nigms.nih.gov/Style%20Library/NIGMS/images/Chromosome%20Video%20for%20ECI%202019%20-%20GIF.gif)
Women have two X chromosomes (XX) and men have one X and one Y (XY), right? Not always, as you’ll learn from the quiz below. Men can be XX and women can be XY. And many other combinations of X and Y are possible.
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