Parthenogenesis is a unique form of reproduction that refers to the fact that an oocyte can develop into a normal individual without fertilization,either spontaneously or through physical or chemical stimulation,without the involvement of sperm.In lower ani-mals,parthenogenesis can be accomplished by females alone,thus enabling the production of offspring from a single female.In mam-mals,however,instances where parthenogenesis can develop into normal individuals are extremely rare.In this paper,we describe how parthenogenesis is activated,how parthenogenic embryos are acquired,and how imprinted genes are used in parthenogenesis,with a view to providing ideas for future applications of parthenogenesis.