GhostWriter16
Deity
You can't really call pure biology into this. As El Mac has pointed out so many times in all these threads, there is no clear delineation between life and not life. Both parents are human life, the sperm and the egg are both human life, the fertilized egg is human life, the fetus is human life, and an infant is human life.
If you want to declare that "life begins", you have to draw an arbitrary line somewhere. Fertilization is an emotionally compelling choice, but not a biologically meaningful one.
I disagree. The sperm and egg alone are simply the DNA of the man and woman who once possessed those things. Thus they are not distinct life of their own. Just as importantly, they will never, ever, under any circumstances, become a distinct human being alone. Even if you throw cloning in, which requires artificial conditions and thus is not applicable, its still really, biologically, not distinct from the parent.
The sperm and egg together, on the other hand, are biologically a person. The DNA is all there for the new, fully grown human being. It will grow into a newborn baby if left alone in the mother's womb.
And if sentience is the factor, why do the unconscious have rights?
I just see no good reason to draw the line anywhere other than conception. But if you do, you can only draw it out to two months because all of the organs are present by then.