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So let me draw a nucleus. Or for women to show it, she has to have both versions of it. Actually, there's several types of hemophilia. So if you have an x chromosome-- and we'll talk about in a second why you can only get that from your mom-- an x chromosome from your mom and a y chromosome from your dad, you will be a male. Who determines whether their offspring are male or female? But these are just kind of the standard genes that have nothing to do with our gender. This video represents the phenomenon of YouTube fame.