171 194 2004f-962 2008c-154 2013j-166 abortion aspectmoral bioethicalissues bioethics bioethicsreproductionfetus biologicalevolution bioéthique casestudies chimerism collectedworks death embryologiehumaine embryology embryonicdevelopment ethics evolution history human humanembryo humanreproductivetechnology identity(psychology) induced jurisprudence lawandlegislation legislation life lifeanddeath medical medicalethics moralandethicalaspects personhood phenomenology philosophy powerover prenataldiagnosis religion religionandscience religionandsociology religions religiousaspects reproductivetechniques self twins w61 w61d3132009 wb60