obsolete cell morphogenesis involved in unidirectional conjugation true biological_process This term was made obsolete because unidirectional conjugation occurs only in prokaryotes, which do not undergo morphogenetic changes associated with conjugation. In short, the process described by this term does not occur. GO:0000763 OBSOLETE. The change in form (cell shape and size) that occurs during sexual reproduction in order to facilitate direct contact between the compatible mating types in organisms that undergo unidirectional conjugation. cell morphogenesis involved in unidirectional conjugation