Ummm…ya lost me. What bears human DNA that is not a person? … Whatever, can you explain a bit more?
SpiritMeadow, the problem is with a theology that might be called “all-humans-and-only-humans-possess-immortal-souls.” It would have a problem dealing with liminal cases, of which I offer three examples:
(1) We know that at least 30% of all conceptions end in spontaneous abortion, most before a woman even knows that she has been pregnant (the rate may be higher than this). Quite often the reason has nothing to do with the uterine environment; it has to do with chromosomal or other genetic abnormalities so severe that the conceptus could never develop into a human person. A theology of “all-humans-and-only-humans-possess-immortal-souls” would have a difficult time dealing with this. The only way this kind of conception could develop into a mature adult would be to be other than it is, which is to say that it could only develop human personhood if it were not.
(2) Teratomas, or monstrous tumors, often contain human genetic material that for one reason or another can never develop into a human person. I have a friend who in her 30s had a tumor excised from her arm that contained some perfectly formed human teeth set in bone; other teratomas might contain a fully-formed finger, or a swatch of skin with hair follicles in it. There is no question that these tumors are the result of human DNA activity, switching on gene development in only one area. There is no “person” hiding behind a finger or teeth or swatch of skin, waiting to develop. A biologist colleague with whom I share an office had a grad school colleague with a dermoid cyst, an unfertilized egg that began dividing on its own in her ovary; when removed it was the size of a football and had inside it bone, hair, and other genetically human material. It was haploid, therefore not a human life that had begun at conception. I cannot understand how such tumors might be said to have “souls.”
(3) Researchers have grown a human ear on the back of a mouse by stimulating the gene for ear development. Is this a “potential person” with a “soul”?
So, an “all-humans-and-only-humans-possess-immortal-souls” theology would have to account for these liminal cases, and for that fact that there are non-human primates with far more developed skills at communication than some humans will ever have. You might enjoy a book by a Christian biologist, John Medina, “The Outer Limits of Life” (1991).
Prayerfully yours,
Petrus