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In the 1930s, George Beadle and Boris Ephrussi discovered factors that affect eye colors in developing fruit flies.
Fruit-fliesImaginal DisksGeneticsdevelopmentMetamorphosis, BiologicalIn 1935, George Beadle and Boris Ephrussi developed a technique to transplant optic discs between fruit fly larvae.
Fruit-fliesImaginal DisksGeneticsdevelopmentMetamorphosis, BiologicalThis diagram shows how NCCs migrate differently in rats, birds and amphibians.
Neural CrestEmbryosVertebratesGerm LayersEctodermThis diagram shows the life cycle of Neurospora crassa, a mold that grows on bread. N.
Neurospora crassaMicrobiologyMicroscopyGrowthdevelopmentY-chromosomes exist in the body cells of many kinds of male animals.
Y ChromosomeX chromosomeSex ChromosomesChromosomesSex ChromatinThe first successful cloning of a gaur in 2000 by Advanced Cell Technology involved the cells of two animals: an egg cell from a domestic cow and a
GaurCloningCattle--CloningExperimentsOrganismsFrom a developing embryos three primary germ layers, ectoderm (green), mesoderm (pink) and endoderm (yellow), a variety of differentiated cell type
MesodermGastrulationBlastulaGerm LayersEctodermMechanism of Notch Signaling: The image depicts a type of cell signaling, in which two animal cells interact and transmit a molecular signal from o
Notch genesNotch ProteinsCellular control mechanismsdelta proteinSignal PathwaysThe Southern Gastric Brooding Frog (Rheobotrahcus silus) was a frog species that lived in Australia. It was declared extinct in 2002.
EggsFrogsAustraliaTadpolesAmphibians--LarvaeBetween 1934 and 1945, George Beadle developed a hypothesis that each gene within the chromosomes of organisms each produced one enzyme.
CellsGeneticsEnzymesGenesAmino Acids