ASEXUAL AND SEXUAL REPRODUCTION - THIS BASIC DISTINCTION SEEMS TO HAVE LOST ANY BELIEF

Parthenogenesis is a reproductive mechanism derived from sexual reprod uction, that biologists during the first decades of our century, consi dered as distinct from asexual reproduction, namely, the vegetative mu ltiplication. Pseudogamy is genetically similar to parthenogenesis. Ho wever, recent authors have adopted a different point of view, consider ing as asexual the mechanisms involved in parthenogenesis and in pseud ogamy. Events evidenced in pseudogamic planarians have shown that the latter phenomenon possesses the basic features of sexuality.