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Sperm cell & X chromosome?

Dentista08

looking for a practice!
10+ Year Member
5+ Year Member
Jul 25, 2008
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Boston, MA
  1. Dental Student
  2. Dentist
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
 
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