This model demonstrates cloning of sheep. Press "Start" button to observe the successive steps of the process. A cell extracted from the sheep-donor is inserted inside of nucleus-free egg cell of stepmother and after initiation of cell division an embryo obtained is implanted into stepmother. Pregnancy proceeds in the ordinary way and is ended by birth of the new sheep which is genetically identical to sheep-donor. Cloning of a sheep was performed for the first time in 1997. Recently some new reports about the cloning of humans appeared. The "Next" button continues the animation, while the "Reset" button returns it into initial state.