| 11. | During their lifetimes, men's sperm cells continue to reproduce by dividing.
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| 12. | By age 15, sperm cells have undergone roughly 35 cell divisions.
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| 13. | Consider the very small tail or Flagellum on a sperm cell.
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| 14. | The sperm cells were not fully developed sperm, but rather their tail-less precursors.
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| 15. | Telomeres are kept long in egg and sperm cells by the enzyme telomerase.
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| 16. | Sperm competition is also a major factor in the development of sperm cells.
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| 17. | The Y-chromosome sperm cells contain about 2.8 percent less genetic material.
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| 18. | The genes stuck naturally to the outside of the sperm cells.
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| 19. | There are small sperm cells swimming over the whole canvas.
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| 20. | In that way, they can best conserve the precious sperm cells, Rothman explained.
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