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Nina: Thanks so much for this good factual information! Wendy -----Original Message----- ... Subject: Are scientists agreed that human life begins at fertilization? Scott F. Gilbert, a Professor of Biology at Swarthmore College, received his B.A. in both biology and religion from Wesleyan University, earned his PhD in biology in the pediatric genetics laboratory at the Johns Hopkins University and teaches developmental genetics, embryology, and the history and critiques of biology, asks: Are scientists agreed that human life begins at fertilization? No. There are several scientifically defensible positions as to when human life begins. One position is that human life begins when the human egg and sperm nuclei fuse at fertilization. This is the "genetic view." A second position is that human life begins when the embryo becomes an individual. This is the time, 14 days after fertilization, when each embryo can produce only one individual, rather than twins or triplets. In religious terms, this would mean that ensoulment (whatever that may be) must occur after day 14, since twins are separate individuals. In the United Kingdom, this 14-day "embryologic view" of human individuality is the basis for human biological research, and it has been adopted by the entire biomedical research community there. It has the force of law in the Human Fertilisation and Embryology Authority that licenses and governs Britain's embryo and stem cell research. A third position is that human life begins when the human-specific electroencephalogram (EEG) is acquired at around 25 weeks. Since our society has defined human death as the loss of the EEG pattern (and not, say, when the heart stopping or the cells dye), some scientists have argued that the acquisition of this EEG pattern be considered the time when the fetus becomes human. The fourth position is that human life begins when it can be metabolically independent from the mother, the traditional "birthday." So there are several scientifically defensible positions as to when a new human life begins. (to read or download his complete bio and entire stem cell primer, click on http://www.txamr.org/download_tamr.asp ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn