A picture of a sperm

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But sperm cells are only one component. In fact, a man's Y chromosome looks just like his father's and his father's father's, and so on, back through the generations. But because so many start their journey, plenty make it to the egg. Human sperm-making machinery is a bit lazy. Niederberger says the idea that wearing boxers will help boost fertility is probably misguided. To fertilize an egg the old-fashioned way, sperm need to be able to swim. Stock Photo - Sperm splash in hand. Semen also contains substances from the prostate and a pair of rabbit ear-shaped organs inside the pelvis called the seminal vesicles. In fact, the average ejaculate contains million sperm. Note that the pseudopod, on the right, moves forward bringing the cell body of the sperm with it.

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