PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Fertilisation. Light micrograph of two human egg cells surrounded by spermatozoa (sperm) prior to fertilisation. Each egg will be penetrated by a single sperm. The sperm's genetic material fuses with that of the egg, creating a zygote with the full 46 human chromosomes, 23 from each parent. Around each egg is the thick zona pellucida layer. Photographed at Cochin Hospital, Paris, France. Magnification unknown.
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