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Wilhelm Ludvig Johannsen (1857-1927)
By: B. R. Erick Peirson
| Published: Nov 16, 2012
Wilhelm Ludvig Johannsen studied plants and helped found the field of genetics, contributing methods and concepts to the study of heredity around the…
GeneticsHeredityPhenotypeGenotype-environment interactionEvolution
Richard Woltereck's Concept of Reaktionsnorm
By: B. R. Erick Peirson
| Published: Sep 06, 2012
Richard Woltereck first described the concept of Reaktionsnorm (norm of reaction) in his 1909 paper 'Weitere experimentelle Untersuchungen uber Art-…
Woltereck, Richard, 1877-1944EvolutionDaphniaEmbryologyHeredity
Richard Woltereck (1877-1944)
By: B. R. Erick Peirson
| Published: May 13, 2012
Richard Woltereck was a German zoologist and hydrobiologist who studied aquatic animals and extended the concept of Reaktionsnorm (norm of reaction)…
PeopleEvolutionHeredityEmbryologyAquatic animals
Theodor Heinrich Boveri (1862-1915)
By: Inbar Maayan
| Published: Mar 03, 2011
Theodor Boveri investigated the mechanisms of heredity. He developed the chromosomal theory of inheritance and the idea of chromosomal individuality…
PeopleHeredityBiography
The Interpretation of Development and Heredity (1930), by Edward Stuart Russell
By: Mark A. Ulett
| Published: Jan 31, 2011
First published in 1930 and reprinted in 1972, Edward Stuart Russell's The Interpretation of Development and Heredity is a work of philosophical and…
LiteratureHeredityPublications
Tay-Sachs Disease
By: Kristin Kelley
| Published: Oct 29, 2010
In 1881 British opthalmologist Warren Tay made an unusual observation. He reported a cherry-red spot on the retina of a one-year-old patient, a…
Tay-Sachs DiseaseCongenital DisordersHeredity
Nettie Maria Stevens (1861-1912)
By: Kaitlin Smith
| Published: Jun 20, 2010
Multiple theories about what determines sex were tested at the turn of the twentieth century. By experimenting on germ cells, cytologist Nettie Maria…
PeopleHeredityReproductionBiography