Every pro-lifer should see this show!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
http://health.discovery.com/tvlistings/episode.jsp?episode=0&cpi=111185&gid=0&channel=DHC
There is a significant abortion-related aspect to the "chimerism" phenomenon that is not discussed in that show, and so I will discuss it here. First note that chimerism is known to happen at least two different ways. (1) A blastocyst (cluster of cells perhaps a few days after fertilization) splits, which normally yields identical twins, or even conjoined (Siamese) twins, but during chimerism the the two independent clusters merge back together to form a single cluster again. This sort of chimera can be difficult to detect, because the overall genetics is so similar (despite differences that inevitably start happening while the clusters are separate). (2) Two blastocysts from separate egg-fertilizations (fraternal twins) merge together; they may be of the same sex or of opposite sexes (and can cause hermaphroditism). This sort of chimerism can give "type"-matching geneticists fits; the blood, for example, may have resulted from one of the merged cell-clusters, while the heart may have resulted from the other -- so trying to tissue-match the heart for a transplant, based on blood work, can be fatal. The "I Am My Own Twin" documentary, linked above, describes a case where one woman almost had her children taken away because the genes in her blood didn't match the genes in her reproductive system.
With that background information, consider that the extreme pro-life stand is that every fertilized human egg, and the organism that results from it, should be counted as a person (so if there are two of them, there are two persons). Well, when chimerism happens,
both clusters of cells continue to exist healthily. No aspect of their "independent" lives-as-organisms is lost when chimerism happens,
except they have traded their independent existence for symbiosis. A chimera is the ultimate case of a conjoined twin.
Well, conjoined twins are usually counted as two persons, right? Therefore, shouldn't every chimeric human be counted as two persons, and be given two votes? That
is the logical conclusion of insisting that two human organisms, both still fully alive, even if existing symbiotically instead of independently, equate to two persons, isn't it?
If it is not logical, then that can only be because there is something fundamentally wrong with equating an organism-count to a person-count. That is,
minds are persons, not organisms/bodies. This conclusion matches other data, such as the cases where one twin of a conjoined pair is incomplete (no head, so no second mind, so no second person). And it matches the data about brain-dead humans on life-support, regarding which various Courts have determined it is acceptable to "pull the plug", because
the person, the mind is gone, even if the empty human animal body remains alive.
The relevance of the preceding logic about persons, to the abortion issue, should now be clear. Unborn humans are all "empty human animal organisms/bodies", and not persons. Even in late pregnancy, when various mind-associated characteristics begin to appear, these characteristics are all only animal-level (no fetus can be smarter than an adult cow, due to having less brain than an adult cow; see the brain-size facts for yourself:
http://staff.washington.edu/chudler/facts.html ). Humans do not grow enough brain to support person-level mentation until well after birth. In fact, some aspects of person-class mentation are known to require up to three years of brain growth; see
http://www.sciam.com/article.cfm?chanID=sa006&colID=1&articleID=000ACE3F-007E-12DC-807E83414B7F0000 . That is, the scientific data clearly tells us that there is a "gray area" where every young human animal grows into a human person, but this gray area is not entered until some time after birth occurs. And therefore even late-term abortions cannot possibly involve the killing of human persons; it always and only involves the killing of empty human animal bodies.