| The lance is used to accumulate and retain DNA and is then introduced into an animal's pronucleus, where the DNA is released. |
| Although the membranous envelope surrounding the male pronucleus rapidly disintegrates in the egg, a new envelope promptly forms around it. |
| In fact, occasionally, only one pronucleus is produced, and there is now evidence that suggests, that this pronucleus is diploid. |
| One pronucleus corresponds to the female pronucleus and the other to the male. |
| If this is true, the centrosome of the zygote nucleus must be entirely derived from that of the male pronucleus. |
| 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. |
