1) The unfertilised egg cell began to divide to produce embryos that sometimes developed well.

2) The egg cell appeared to be an active cell.

3) The egg cell contained many ribosomes , polysomes, mitochondria with distinct cristae, RER . Dictyosomes had vesicles.

4) Before the discovery of the egg cell, many scientists believed that the head of each sperm cell contained a fully "preformed" little person ( homunculus ).

5) While this is occurring an unfertilized egg cell is taken from a Blackface ewe with its DNA filled nucleus taken out leaving a nucleus free egg cell that will later produce an embryo (3).

6) Synergid cells Two haploid cells located near the egg cell at the micropylar end of the embryo sac in flowering plants.

7) The nucleus from sheep B and the egg cell from sheep A are joined using electricity.

8) To bypass this impediment an almost mature egg cell is removed surgically.

9) The sperm has fused to the egg cell membrane (oolemma) prior to becoming incorporated almost completely into the egg. The zona pellucida has been removed in this preparation.

10) The brown membrane surrounding the egg cell is the zona pellucida. The head of the sperm carries special enzymes to dissolve this membrane,[http:///egg cell.html] which it must do in order to fertilise the egg.

11) An egg cell cannot develop into a new life by itself.

12) Egg cell and sperm cells. Schematic drawing showing their relative sizes.

13) Just as a general egg cell differentiates through epigenesis to become a legion of specialized cells, so in evolution animals and plants split up into varieties more dependent on narrower niches.

14) It involves taking genetic material from an adult mammal and inserting it into an unfertilized egg cell.

15) The genetic material of a cell from a cystic fibrosis patient, for example, can be transferred into an unfertilised egg cell with its own genetic material removed.

16) METHODS Xenopus leavis females were injected with HCG, eggs were harvested next morning and dejellied by 2% cysteine, from which the Xenopus leavis egg cell free translating system was prepared.

17) The two polar nuclei move from antipodal end to micropylar end before sperm releasing in a gap between egg cell and central cell and subsequently taking off cytoplasm one after another.

18) In 1996 Ian Wilmut, of the Roslyn Institute, in Edinburgh, removed the nucleus of an ovine egg cell and replaced it with that of an adult cell.

19) The vaccine works by blocking male sperm cell from joining female egg cell.

20) Venter The swollen base of an archegonium that contains the egg cell ( oosphere ).