Illustration showing the development of monozygotic and dizygotic twins. Identical (monozygotic) twins occur when two cells formed by the first division of a fertilised egg develop independently. Non-identical (dizygotic) twins develop when two separate eggs are released from the ovaries and are fertilised simultaneously. | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / ALI DAMOUH |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |