Walter Sutton proves chromosomes hold genetic information.
	August Weissmann states genetic information of a cell diminishes with each cell division.		Hans Spemann performs first nuclear transfer experiment.	Hans Spemann proposes "fantastical experiment" of cloning higher organisms.		Briggs and King clone tadpoles.
		Hans Spemann divides a Salamander embryo in two and shows early embryo cells retain all the genetic information necessary to create a new organism.		Oswald Avery discovers genetic information is carried by the nucleic acids of cells.		Watson and Crick find the structure of DNA.	F.C. Steward grows whole carrot plants from carrot root cells.