Is it possible for parents to have genetically identical children but on different pregnancies?

Please help me, i've got this title as essay in my developmental biology class and i've got no clue where to begin...What are the arguments for and against?Is it possible for parents to have genetically identical children but on different pregnancies?
1. Naturally: it is possible, but incredibly unlikely, due to the assortment of the chromosomes at meiosis, and crossover. When I say ';incredibly unlikely';, I mean the odds are more than 70 trillion to one against.





2. Unnaturally: it is possible, using in vitro techniques available today. The growing embryo in vitro would be cut in half at or before the 16 cell stage; half would be frozen, and the other half implanted. Some time in the future, the other half would be implanted. This could result in identical twins, with one twin delayed.





3. Cloning is coming, but we can't do it yet with humans.Is it possible for parents to have genetically identical children but on different pregnancies?
If there is in-vitro fertilization, a set of twins could be separated, and therefore they would occupy different pregnancies, but be genetically identical, n'est pas?
Allo mamzelle devoir pugo in fer pu fer un peu recherche par ou meme pas nek al rode lors yahoo answers :p lol. bez sa kifer mo pane pense sa avant twa mwa la.