Magneto wrote:
So, at what point does the fetus become a person? Personally, I go for the 2 week limit (primitive streak), because before that point each of the cells could become an entirely new organism (okay, not entirely, but twinning is still possible), but after that point, it's definitely one single organism.
Having the ability to become an entirely new organism does not mean you are not a person, nor does being a unique organism make you a person.
The second statement is obviously true, because we kill unique organisms without batting an eyelid all the time. The first is perhaps harder, but there are animals that regrow two bodies when they are cut in two, for example. If humans could do that, would we not be people?
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Also, I don't know of any other such major points after that,
As suggestions:
1) The development of the brain... except most people don't think "having a brain" is sufficient for personhood (although it is currently necessary- there are no known persons without brains)
2) Quickening- but movement is neither necessary or sufficient for personhood
3) Consciousness- yes, this is necessary for personhood, but it is hard to determine when it first develops. It certainly is not before 2 weeks, or 4 weeks, or 24 weeks.