vajaradakini: At any rate, your insistance on the discussion of value of life has nothing to do with the initial thread topic which is when life begins. I'm not sure how kindly people here take to hijacking threads, I know some places that don't like it when people do so and being new, I do not wish to step on any toes. I also see your insistance on putting value on each life to be rather silly as it is rather subjective.
Since I started this thread, I do appreciate your care in trying to stay on topic. I also am new to the board, and I also prefer not to step on toes. A nice respectful discourse is so much more productive. For this particular thread, I do believe that the value of life is a valid and crucial aspect to introduce to the conversation. To me it is a critical aspect of humanness. We are not plants, or other non-human lifeforms sitting here discussing things, wondering at the world and life. I work daily with plants -- I have no compunction about damaging one although I try not to for aesthtics and disease issues. I have even been known to rip a plant out of the ground if it fails to perform as expected or desired. But I take care not to do harm to other creatures and specifically I care more for the safety of humans. I hit and killed a neighbors dog recently. I was devastated, quite torn up about it as was the neighbor. He has another dog, I drive quite slowly and carefully past his house now (very rural area, hence free running animals). However if that had been a human, a child even more so, I'd probably give up driving all together and require excessive counseling. We really mustn't remove our concern for each other and our value of human life from the debate. Why else debate the points at all? You are concerned about stepping on the proverbial toes . . . why shouldn't all human life that has been conceived (and not been washed out due to nature) be allowed to keep theirs?
Are identical twins one person then?
Identical twins to not split until a week or so after conceived
I'm not a scientist so I posit this question: Do we know everything there is to know about DNA? If yes, how do we know that we know everything there is to know? Could there possibly some marker, or combinations of markers, that cause the split so that twins were preordained at fertilization? Hmmm, I guess that is a stupid question. My daughter is determined to marry a man who "has twins or triplets running in his family". Twinning is written into the DNA, and at fertilization, well before the split, they are two individuals who are just in need of a bit more development to display their individuality to our intelligent and curious minds.
and a chimeric embryo can be formed after sex differntiation.
Is a chimeric person two?
(Chimera is when two ovum, embryo et c merge into one, thus a single person is the product of two eggs and two sperm)
I had to try to look that one up, but have limited time to delve into it further right now. So far what I've seen are numerous references to the mythological creature, a monster, a dream, an unreachable idea/ideal, etc and one reference to "an individual, organ, or part consisting of tissues of diverse genetic constitution" -- quite a vague description to say the least. I've not accessed the proper medical texts yet, obviously. From what I can assess at this point, aren't most chimera genetically manipulated by humans (tiger and lion = tigon, etc)? In how many cases does it occur naturally in humans? Is it a mutation? I'm not being factitious, I really don't know. I will still research it myself, but if you'd care to explain I'd also like to see your definition of the term chimera and the circumstances you believe causes it.
Finally, why is it that more than half of all life is terminated before pregnancy even begins?
Could you please expand/explain this question? Are you referring to unfertilized ovum, or unused sperm? My answer, based on how I read your question: Pregnancy begins at conception no matter what happens to the fertilized egg afterwards. An unfertilized egg or unused sperm does not constitute a life. Thus no termination of life.
But each living human cell is not an individual human life.
See my above
Unique DNA is not a qualification for a human life either, as idencial twins are obviously two individual organisms who share the same DNA.
See my above
A chimeric person is a single person who has two sets of DNA. Yet, they are one inidvidual organism.
See my above