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Oscar Hertwig

The Columbia Encyclopedia, Sixth Edition

Oscar Hertwig , 1849-1922, German embryologist. He studied medicine with Haeckel and Gegenbaur. In 1875 he established the fact that fertilization consists of the union of the nuclei of a male and a female sex cell. He studied the germ-layer theory (introducing the term coelom ) and malformations of vertebrate embryos.

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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press

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	Gregor Johann Mendel ...prelate in 1868. Failing eyesight and his duties as prelate somewhat curtailed his researches; although he anticipated Oscar Hertwig's discovery that fertilization of an egg involved only one male sex cell, these findings went unpublished. Mendel was... Read more
	cytology ...pronouncement (the cell theory) was confirmed and elaborated by a series of discoveries and interpretations. In 1892 Oscar Hertwig (1849–1922) suggested that processes at the organism's level are reflections of cellular processes, thus establishing... Read more
	History of Biology: Inheritance ...techniques to study the physical processes of the cell (a branch of biology called cytology ). In 1875, the German anatomist Oscar Hertwig was the first to observe a sperm penetrating an egg (of a sea urchin), thereby lending credence to the idea that a... Read more
	heredity ...specific body part—which circulated in the body and eventually collected in the reproductive cells. Finally, in 1875, Oscar Hertwig's principle of the universality of fertilization in sexual reproduction confirmed the transmission of hereditary material... Read more