BSIP, JACOPIN / SCIENCE ET V / SCIENCE PHOTO LIBRARY BSIP, JACOPIN / SCIENCE ET V / SCIENCE PHOTO LIBRARY
Reproduction. Artwork showing human reproduction, with boxed enlargements of each stage (top to lower left then centre to bottom right). A sperm and oocyte are also seen (centre left). The ovary releases the oocyte into the fallopian tube (ovulation, upper centre). A sperm penetrates it (top left) and the parental chromosomes (blue and pink) mix. The zygote divides (far left), increasing in cell number. It enters the uterus (far right), forms a hollow blastocyst (centre right) and implants in the uterine lining. The placenta and umbilical cord are formed, which nourish the foetus (bottom right) until birth.
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