* As discussed previously in an article in this blog entitled "Embryo and Human Dignity" (see), the zygote is the first human cell of any individual and marks the moment of new life.
* What distinguishes the zygote of any other human cells: the fact that a totipotent cell.
There is scientific evidence that the zygote is a new living being, belonging to the human species and is, therefore, a new persona.Algunos, sim, however, oppose this objection twins identical twins.
* If a zygote, they say, may be two embryos (through a division that takes place before day 14 of life) is not possible to say that the zygote is an individual, because this could be dos.Y argumrnto is could argue that human life started from day 14 of concepción.El twinning problem, they say, could be a barrier to defend the personal status of the embryo.
* What is twinning?: The division of the zygote into two embryos before implantation in the uterus and, of course, both have the same DNA (there are two people IDET).
The twinning is possible because the embryonic cells retain their ability totipotent in the first moments and the error of division can give rise to two separate individuals (this happens in 0.2% of pregnancies). In these cases, from the moment that is lost when the embryo totipotency can guarantee the uniqueness of the individual.
* We can therefore say that until day 14 is not possible to know whether the zygote results in a single individual or two, but that does not reveal what is there before the 14 th day life is not humana.No because let's say from one moment there are two lives we can conclude that what I had before was not human life.! Of course it is!: what else could it be?.
* To better understand The issue before us is to distinguish between individuality and the twinning phenomenon unicidad.El only means that genetic individuality does not mean the indivisibility, at least 0.2% of casos.Además, the fact of a division is not possible merely supports the continued development of embrión.Las two identities arising from this fact agree in their genetic identity because they come from a single zygote, but thong this point of separation are restructured as different individuals.
* The destruction of embryos (from the perspective of the twinning) presents an ethical problem even worse, because what is destroyed is not only a human life, but potentially more than one.
(The contents of this article has been extracted from an excellent job on the blog "Bioethics Today: bioeticahoy.com.es the 22-XII-2010.Autor: Agustín Losada)
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