Sperm cell & X chromosome?

[Dencology]

How come sperm cell does not contain X chromosomes?

i don't get this?

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[Dentista08]

How come sperm cell does not contain X chromosomes?

i don't get this?

It does! 50% of the time though. Sperm either contain Y OR X and when it combines with an egg (which only can have X, since females are XX), it makes a boy XY or a girl XX

 

[Dencology]

It does! 50% of the time though. Sperm either contain Y OR X and when it combines with an egg (which only can have X, since females are XX), it makes a boy XY or a girl XX

all right.