Forward genetics a bare minimum for the appearance of specific phenotypes. However, such initial screens were either incomplete as they were missing redundant loci and epigenetic effects, and such screens were difficult to undertake for certain phenotypes that lack directly measurable phenotypes. Additionally a classical genetics approach takes significantly longer. Gregor Mendel experimented with pea plant phenotypes and published his conclusions about genes and inheritance in 1865. Around the early 1900s Thomas Hunt Morgan was mutating Drosophila using radium and attempting to find heritable mutations Alfred Sturtevant later began mapping genes of Drosophila with mutations they had been following. In the 1990s
Johann Gregor Thalnitscher Johann Gregor Thalnitscher Johann Gregor Thalnitscher von Thalberg (10 March 1655 – 3 October 1719; less often known by his Slovene name "Janez Gregor Dolničar") was a Carniolan lawyer, scholar of ancient inscriptions, chronicler, and historian. Thalnitscher was born in Ljubljana on 10 March 1655 to Johann Baptist Thalnitscher and Maria Anna née Schönleben. His father was a Ljubljana judge and mayor, and made it possible for his son to study and travel throughout Germany and Italy, where he developed an enthusiasm for Baroque art. He studied in Ingolstadt and Bologna, and became a doctor of law in Bologna in