| Although the membranous envelope surrounding the male pronucleus rapidly disintegrates in the egg, a new envelope promptly forms around it. |
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| One pronucleus corresponds to the female pronucleus and the other to the male. |
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| Diploid zygotes created by combining a male and a female pronucleus gave rise to viable embryos, but combining two male or two female pronuclei did not. |
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| In fact, occasionally, only one pronucleus is produced, and there is now evidence that suggests, that this pronucleus is diploid. |
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| Without to ocytes activation, male pronucleus and female pronucleus unable to formed together into zygote. |
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| The lance is used to accumulate and retain DNA and is then introduced into an animal's pronucleus, where the DNA is released. |
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| Before fertilization a type of cell division called a reduction division brings the number of chromosomes in the female pronucleus down to 23, including one X chromosome. |
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| After its entry into the egg cytoplasm, the spermatozoal nucleus, now called the male pronucleus, begins to swell, and its chromosomal material disperses and becomes similar in appearance to that of the female pronucleus. |
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| Each pronucleus stores the genetic material characteristic of the partner from which it comes, and the combination of these two shall determine the genetic makeup of the new embryo. |
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| After the encounter of the two pronuclei, one quadrant of the former positive cross of the monaster is missing on the side of the egg pronucleus. |
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| After the 4 hr incubation for fertilization and the following 3 hr of culture in fresh medium, zygotes were evaluated for pronucleus formation by using an inverted microscope. |
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