| 11. | The experiment was terminated before the sperm made it into the egg cell.
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| 12. | Egg cells travel through the oviduct to the fertilization chamber, where fertilization occur.
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| 13. | In developing the human clone, the researchers started with a donated female egg cell.
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| 14. | It happens when the oocytes, or egg cells, in her ovaries are used up.
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| 15. | The altered egg cells, called oocytes, are chemically manipulated to make them start dividing.
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| 16. | Sperm and egg cells similarly only share some of the chromosomes of the parent.
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| 17. | Recently, other scientists reported that they had turned mouse stem cells into egg cells.
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| 18. | Fertilization is the event where the egg cell fuses with the male gamete, spermatozoon.
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| 19. | Each egg cell possesses a random selection of genes from its mother or father.
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| 20. | Each of them contains a single oocyte ( immature ovum or egg cell ).
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