ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Fertilisation. Computer illustration of a human egg cell surrounded by spermatozoa (sperm) prior to fertilisation. The 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.
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