author
Oscar Hertwig
1849–1922
A pioneer of embryology, he helped show that fertilization begins when the nuclei of sperm and egg unite. His microscope studies of sea urchins helped change how scientists understood reproduction, heredity, and development.
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About the author
Born in Friedberg, Hesse, on April 21, 1849, Oscar Hertwig became one of the key figures in early developmental biology. He studied medicine and zoology and built his career as a German embryologist, zoologist, and anatomist at a time when scientists were just beginning to understand the cell.
Hertwig is best remembered for his work on fertilization. By observing sea urchin eggs under the microscope, he recognized that the essential event was the union of the nuclei of sperm and egg. That insight was a major step toward modern cell theory, genetics, and embryology. He also wrote influential textbooks and broader works on biology and evolution, helping bring new ideas to students and researchers.
Later in his career, Hertwig taught in Berlin and remained an important voice in debates about development and heredity. Today he is remembered as a careful observer whose experiments gave biology one of its clearest early views of how new life begins.