Human egg cell. Computer illustration of a human ovum (egg cell), showing the zona pellucida (outer layer). After fertilisation the nuclei of the sper

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Human egg cell. Computer illustration of a human ovum (egg cell), showing the zona pellucida (outer layer). 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.

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Size: 4200px × 4200px
Photo credit: © MAURIZIO DE ANGELIS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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