“…Hypoxia and Abnormal Implantation Buchner (1958), produced a variety of malformations in various amphibian and avian species by hypoxia. Similar to Goldschmidt's assumption (1935) for Drosophila he felt that in man 'each genetic malformation can be copied by one caused exogenously'; thus, Buchner continues, 'exogenous malformations are in principle phenocopies of malformations which may also be genetic'.…”