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akuma587 said:
Tispower1 said:
Fertilalisation, as from that point the 'baby' has a full genetic code, and the potential to be human. That is also the point where it starts growing.

 

Development =/ Life.  The egg and the sperm were already alive.  I can put my cheek cells in a petri dish and culture them, but that doesn't mean they will ever turn into an organism or anything meaningful.

There is no magical transformation from life to non-life, as both of the components of a fertilized egg were alive beforehand.  Thus being "alive" by a human standards would have to be something different.  These are the most plausible theories:

1) When brainwave activity begins (around end of 1st trimester)

2) When the baby becomes self-aware (later in the pregnancy)

3) When the baby can survive outside the womb (depends greatly, but pretty much without exception no fewer than five months)

A baby is definitely already "alive" when it is born, so that theory should be thrown out.

I think the difference people make between your own cheek cells in a petri dish and a zygote is that your cheek cells are your genetic code. They are simply cells that contain your life code. A zygote, however, has a completely different genetic code. It has its own 46 unique chromosomes. When conception takes place, you have a genetically unique, newly existing, individual, whole living human being. It may not be developed, but it is still a unique human entity. Is this when life begins? I am not sure. I still, however, believe it is wrong to prohibit that entity from developing.