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The Yale Embryo
By: Kaitlin Smith
| Published: Jun 28, 2010
In 1934 a fourteen-day-old embryo was discovered during a postmortem examination and became famous for being the youngest known human embryo specimen…
ReproductionSpecimensHuman Development
Chorionic Villus Sampling
By: Katherine Brind'Amour
| Published: Jan 21, 2009
Chorionic villus sampling (CVS) is a test used for prenatal diagnosis. Safe to perform at an earlier stage in pregnancy than amniocentesis, CVS is…
TechnologyChorionic Villus SamplingChorionic Villi SamplingReproduction
Marcello Malpighi (1646-1694)
By: Cera R. Lawrence
| Published: Sep 12, 2008
Marcello Malpighi studied chick embryos with microscopes in Italy during the seventeenth century. Trained as a medical doctor, he was among the first…
MicroscopyHistologyChick Embryo
Franklin Paine Mall (1862-1917)
By: Kimberly A. Buettner
| Published: Nov 01, 2007
Franklin Paine Mall was born into a farming family in Belle Plaine, Iowa, on 28 September 1862. While he attended a local academy, an influential…
BiographyEducation
David Edwin Wildt (1950- )
By: Caroline Appleton
| Published: Jul 24, 2014
David Edwin Wildt developed and applied assisted reproductive technologies to conserve rare and endangered wildlife species in the US during the…
CheetahFertilization in VitroEmbryo transplantationReproductive technologyEndangered Species
DNA and X and Y Chromosomes
By: Anna Guerrero
| Published: Feb 06, 2017
Y-chromosomes exist in the body cells of many kinds of male animals.
Y ChromosomeX chromosomeSex ChromosomesChromosomesSex Chromatin
Digit Regeneration Is Regulated by Msx1 and BMP4 in Fetal Mice (2003), by Manjong Han et al.
By: Joe Brinkman
| Published: Apr 13, 2015
In the early 2000s, Manjong Han, Xiaodang Yang, Jennifer Farrington, and Ken Muneoka investigated how genes and proteins in fetal mice (Mus musculus…
Regeneration (Biology)MiceRegenerationHomeobox genesBone Morphogenetic Proteins
George W. Beadle's One Gene-One Enzyme Hypothesis
By: Divyash Chhetri
| Published: May 23, 2014
The one gene-one enzyme hypothesis, proposed by George Wells Beadle in the US in 1941, is the theory that each gene directly produces a single enzyme…
Beadle, George Wells, 1903-1989GeneticsGenetics, ExperimentalDrosophila melanogaster
Andrew Zachary Fire (1959- )
By: May Catherine
| Published: Nov 28, 2011
Andrew Zachary Fire is a professor at Stanford University and Nobel Laureate. Fire worked at the Carnegie Institution of Washington's Department of…
PeopleRNA InterferenceBiography
The Aschheim-Zondek Test for Pregnancy
By: Kristin Kelley
| Published: Sep 12, 2010
Throughout history many different methods have been devised for the early detection of pregnancy. From the time of the Ancient Egyptians, inspection…
Pregnancy TestsReproductionFertility