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August Friedrich Leopold Weismann (1834-1914)
By: Yawen Zou
| Published: May 23, 2014
August Friedrich Leopold Weismann studied how the traits of organisms developed and evolved in a variety of organisms, mostly insects and aquatic…
Germ CellsHeredity
Multi-Fetal Pregnancy
By: Corinne DeRuiter
| Published: Jan 01, 2012
In humans, multi-fetal pregnancy occurs when a mother carries more than one fetus during the pregnancy. The most common multi-fetal pregnancy is…
ReproductionFetusHuman Development
Thomas Joseph King Jr. (1921-2000)
By: Sean Cohmer
| Published: Jan 01, 2012
Thomas Joseph King Jr. was a developmental biologist who, with fellow scientist Robert Briggs, pioneered a method of transplanting nuclei from…
PeopleNuclear Transfer TechniquesBiographyNuclear TransplantationCancer
"On the Nature of the Process of Fertilization and the Artificial Production of Normal Larvae (Plutei) From the Unfertilized Eggs of the Sea Urchin" (1899), by Jacques Loeb
By: Steve Elliott
| Published: Jun 10, 2010
Jacques Loeb developed procedures to make embryos from unfertilized sea urchin eggs in 1899. Loeb called the procedures "artificial parthenogenesis…
ParthenogenesisExperimentsSea Urchins
Landrum Brewer Shettles (1909-2003)
By: Stephen C. Ruffenach
| Published: Jul 22, 2009
Landrum Brewer Shettles is remembered as an important contributor to early in vitro fertilization research in the United States as well as a prolific…
PeopleFertilization in VitroReproductionBiographyFertilization
Mary Frances Lyon (1925–2014)
By: Devangana Shah
| Published: Jul 04, 2025
Mary Frances Lyon studied gene expression and developed the theory of X-chromosome inactivation, also called Lyonization, during the twentieth…
Gene ExpressionX Chromosome InactivationLyon HypothesisLyonizationMutation
Trisomy 21 (Down Syndrome)
By: Grace Fitzgerald
| Published: Aug 01, 2022
As of 2022, Trisomy 21 is the most common type of trisomy, or a condition where the person has three instead of the normal two copies of one of the…
Genetic DisordersGenetic disorders in childrenGenetic disorders in pregnancyGenetic disorders--DiagnosisDown syndrome
"A Genomic Regulatory Network for Development" (2002), by Eric H. Davidson, et al.
By: Justin M. Wolter
| Published: Oct 11, 2013
In 2002 Eric Davidson and his research team published 'A Genomic Regulatory Network for Development' in Science. The authors present the first…
LiteratureGene regulatory networksSystems BiologyGenetic regulationGenes
William Keith Brooks (1848-1908)
By: Kaitlin Smith
| Published: Jul 01, 2010
Biologist William Keith Brooks studied embryological development in invertebrates and used his results as evidence for theories of evolution and…
BiographyEducation
"Transplantation of Living Nuclei from Blastula Cells into Enucleated Frogs' Eggs" (1952), by Robert Briggs and Thomas J. King
By: Nicole Newkirk
| Published: Nov 13, 2007
In 1952 Robert Briggs and Thomas J. King published their article, "Transplantation of Living Nuclei from Blastula Cells into Enucleated Frogs' Eggs…
Cell nuclei--TransplantationNuclear Transfer TechniquesExperimentsNuclear TransplantationTransplantation