| The lance is used to accumulate and retain DNA and is then introduced into an animal's pronucleus, where the DNA is released. |
| Without to ocytes activation, male pronucleus and female pronucleus unable to formed together into zygote. |
| 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. |
| One pronucleus corresponds to the female pronucleus and the other to the male. |
| 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. |
| 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. |
