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How much do you know about sperm cells? You know guys make a lot of them--but how many? You know they're small--but how small?

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So goes a common belief, which asserts that sperm with Y chromosomes—those make male babies—swim faster, so you have a better chance of having a daughter if the sperm has to travel a long way to the egg.

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Gametes, ova and sperm, are reproductive cells produced by members of most sexually reproducing species. These cells contain only half the genetic material as compared to all other body cells that comprise a particular organism. Interestingly, none of the gametes will contain the same combination of genetic material. Sperm cells are only produced by male members of a species, not female members.

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