author
Oscar Hertwig
1849–1922
Best known for helping reveal what happens at the very start of life, this German embryologist showed that fertilization depends on the union of the egg and sperm nuclei. His microscope work with sea urchins helped lay foundations for modern developmental biology.
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About the author
Born in Friedberg, Hesse, on April 21, 1849, Oscar Hertwig became one of the major figures in late 19th-century embryology and zoology. He studied medicine and zoology in Jena, Zurich, and Bonn, and later taught at Jena before moving to Berlin, where he became a professor and led important anatomical and biological work.
Hertwig is especially remembered for his studies of fertilization. Working with sea urchin eggs in the 1870s, he recognized that the essential event was the fusion of the nuclei of sperm and egg, a discovery that clarified the cellular basis of sexual reproduction. He also wrote widely on development, heredity, and evolution, helping shape how scientists understood the growth of organisms from a single cell.
He died in Berlin on October 25, 1922. More than a century later, he is still remembered as a careful observer whose research connected microscopy, embryology, and the emerging science of heredity.