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All human female egg cells contain X chromosomes, each cell only contains one chromosome. The male sperm cells can contain either an X or a Y chromosome (one or the other, not both). That is what determines the sex of the child, two Xs and its a girl, one x and one y and its a boy.

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Q: Female sex cells contain a 1 X chromosome b 2 X chromosomes c 1 Y chromosome or d None of these and why?
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