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Muriel Wheldale Onslow (1880-1932)
By: Samantha Hauserman
| Published: Oct 17, 2013
Muriel Wheldale Onslow studied flowers in England with genetic and biochemical techniques in the early twentieth century. Working with geneticist…
PeopleHeredityBiochemistryEpistasis (Genetics)Genetics
Calvin Bridges’ Experiments on Nondisjunction as Evidence for the Chromosome Theory of Heredity (1913-1916)
By: Kevin Gleason
| Published: May 18, 2017
From 1913 to 1916, Calvin Bridges performed experiments that indicated genes are found on chromosomes. His experiments were a part of his doctoral…
DrosophilaHeredityInheritance of acquired charactersColumbia University--Graduate studentsMutation
Wilhelm Johannsen's Genotype-Phenotype Distinction
By: B. R. Erick Peirson
| Published: Dec 07, 2012
Wilhelm Johannsen in Denmark first proposed the distinction between genotype and phenotype in the study of heredity in 1909. This distinction is…
Johannsen, W. (Wilhelm), 1857-1927Genotype-environment interactionPhenotypeHeredityGenetics
Oswald Theodore Avery (1877-1955)
By: Samantha Hauserman
| Published: Dec 12, 2013
Oswald Theodore Avery studied strains of pneumococcus of the genus Streptococcus in the US in the first half of the twentieth century. This bacterium…
Bacterial TransformationDNAHeredityPathologyImmunology
Harry Hamilton Laughlin (1880-1943)
By: Rachel Gur-Arie
| Published: Dec 19, 2014
Harry Hamilton Laughlin helped lead the eugenics movement in the United States during the early twentieth century. The US eugenics movement of the…
Laughlin, Harry Hamilton, 1880-1943American Eugenics SocietyEugenicsDavenport, Charles Benedict, 1866-1944Eugenics--United States--History
Victor Jollos (1887-1941)
By: B. R. Erick Peirson
| Published: Sep 16, 2014
Victor Jollos studied fruit flies and microorganisms in Europe and the US, and he introduced the concept of Dauermodifikationen in the early 1900s.…
ParameciumDrosophilaHeredityProtistaprotozoology
The Passing of the Great Race; or The Racial Basis of European History (1916), by Madison Grant
By: Aliya R. Hoff
| Published: Jul 12, 2021
In 1916, eugenicist Madison Grant published the book The Passing of the Great Race; or The Racial Basis of European History, hereafter The Passing of…
LiteratureEugenicsNuremberg War Crime Trials, Nuremberg, Germany, 1946-1949Involuntary sterilization--Law and legislationInterracial marriage--United States
“Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid” (1953), by James Watson and Francis Crick
By: Victoria Hernandez
| Published: Oct 31, 2019
In April 1953, James Watson and Francis Crick published “Molecular Structure of Nucleic Acids: A Structure of Deoxyribose Nucleic Acid” or “A…
LiteratureDNAComplementary DNADNA ReplicationDeoxyribonucleic Acid
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
David Starr Jordan (1851-1931)
By: Jill Briggs
| Published: Jun 26, 2013
David Starr Jordan studied fish and promoted eugenics in the US during the late nineteenth and early twentieth centuries. In his work, he embraced…
EugenicsEvolutionEmbryosEmbryologyHeredity