Big Picture

Fast fact #42

#42: Human eggs are made in the embryo, so the egg cell that fused with a sperm to become you was actually produced around six months before your mum was born.

Genes
The body
Sex and gender

Bibliography

Source: Gilbert. Developmental Biology.
Originally published in The Big Picture Little Book of Fast Facts
http://www.wellcome.ac.uk/Education-resources/Teaching-and-education/Big-Picture/All-issues/Special-Fast-Facts-book/index.htm

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