The process of unidirectional (polarized) transfer of genetic information involving direct cellular contact between a donor and recipient cell; the contact is followed by the formation of a cellular bridge that physically connects the cells. Some or all of the chromosome(s) of the donor cell is transferred into the recipient cell.
Comment:
Unidirectional conjugation is not a type of not sexual reproduction, since no exchange of gamete occurs and no generation of a new organism: instead an existing organism is transformed.