Fertilised egg cell dividing. Computer illustration showing the process by which a fertilised human ovum (egg cell) divides repeatedly to form a morula within the zona pellucida (outer layer). Clockwise from upper left: After fertilisation the nuclei of the sperm cell and the ovum fuse to form a zygote. The zygote then undergoes repeated mitosis (cell division). Cell division occurs approximately every twenty hours,to form a cluster of cells known as a morula,which continues to divide to form a blastocyst,and subsequently the embryo | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / De Angelis, Maurizio |
Bildgröße: | 5000 px × 3750 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |