It does, and the law recognizes this. We recognize sperm and egg cells as LIVING things. Separate components, certainly, but living nonetheless. Each one contains approximately half of the DNA necessary to create a human being. Now, does the conjoining of the two cells change the nature of the life within them? I believe it would be ludicrous to such a thing. The fundamental difference is the complete set of DNA within the newly created zygote. Some people would argue that this is nothing but a mere clump of cells, to which I reply that essentially, that is what we ALL are. Obviously, we have different stages of development throughout our lives. At this particular stage in question we are unable to have any real thought or any real desire. Some would suggest that his means that person hood does not exist and therefore it is acceptable to disregard this life as non-human. By that definition however, any elderly person with severe Dementia or Alzheimer's would not be considered a person, and could technically be disposed of legally and with moral justification. Obviously, a reasonable mind would find such a thing abhorrent. To separate person hood from any point in our development is to call into question the worth of an individual who is less developed than another, no matter how slight that difference. If a pregnant woman is murdered, the murderer will be charged with TWO murders, regardless of the stage of pregnancy. This would suggest to me that more than just morally, but legally, an unborn human HAS human rights. I rest.
Think about the economic complex! Organs are already being sold in nations where it is illegal. Its called a black market. These surgeries are dangerous, unregulated, and have enormous risks attached. Not only do we face those problems, but we also need to face the unfortunate reality that in a world of illegality, peoples organs are being taken without their consent. If we allow for organ sales legally, we will bring costs DOWN substantially. Insurance companies will be far more willing to spend 5-10k on an organ than to spend 100k on long term care (eg. Dialysis). This bring the amount of organs up, the amount of transplants up, and the amount of people that require donations (over sales) way down. This should be a no-brainer!