(1891–1970), constructed first genetic map of a chromosome John Sulston (1942–2018), UK molecular biologist, Nobel Prize for programmed cell death in C. elegans James B. Sumner (1887–1955), US biochemist, Nobel Prize, found enzymes can be crystallized Maurice Super (1936–2006), South African-born UK pediatric geneticist, studied cystic fibrosis Andrea Superti-Furga (born 1959), Swiss and Italian paediatrician and geneticist, studied disorder of connective tissue, skeletal dysplasias and malformation syndromes Grant Sutherland (born 1945), Australian molecular cytogeneticist, pioneer on human fragile sites, human genome Walter Sutton (1877–1916), US surgeon and scientist, proved chromosomes contained genes David Suzuki (born 1936), Canadian Drosophila geneticist, science broadcaster and environmental activist M. S. Swaminathan (born 1925), Indian agricultural scientist, geneticist, leader of Green Revolution in India Bryan Sykes (1947–2020), British human geneticist, discovered ways to extract DNA from fossilized bones Jack Szostak (born 1952), Anglo-US geneticist, worked on recombination, artificial chromosomes, and on telomeres. He has been awarded a Nobel Prize for its work on telomeres. T Jantina Tammes (1871–1947), Dutch geneticist, one of the first Dutch scientists to report on variability and evolution Edward Tatum (1909–1975), showed genes control individual steps in metabolism Joyce Taylor-Papadimitriou (born 1932), British molecular biologist and geneticist Howard Temin (1934–1994), US geneticist, Nobel Prize for discovery of reverse transcriptase Alan Templeton (born c. 1948), US geneticist and biostatistician, molecular evolution, evolutionary biology Joseph R. Testa (born 1947), US cancer geneticist and malignant mesothelioma biologist whose team cloned AKT genes and co-discovered the BAP1 tumor predisposition syndrome Eeva Therman (1916–2004), Finnish-born US geneticist who helped characterize and find the molecular basis for trisomy 13 and trisomy 18 Donnall Thomas (1920–2012), US physician, Nobel Prize for bone marrow transplantation for leukemia Nikolay Timofeev-Ressovsky (1900–1981), Russian radiation and evolution geneticist Alfred Tissières (1917–2003), Swiss molecular geneticist who pioneered molecular biology in Geneva Joe Hin Tjio (1919–2001), Java-born geneticist who first discovered humans have 46 chromosomes Susumu Tonegawa (born 1939), Japanese molecular biologist; Nobel Prize for genetics of antibody diversity Erich von Tschermak (1871–1962), Austrian agronomist and one of the re-discoverers of Mendel's laws Lap-chee Tsui (born 1950), Chinese geneticist who sequenced first human gene (for cystic fibrosis) with Francis Collins Elena Jane Tucker, Australian geneticist investigating mitochondrial disease Raymond Turpin (1895–1988), French pediatrician, geneticist, Lejeune's co-discoverer of trisomy 21 U Axel Ullrich (born 1943), German molecular biologist, signal transduction, discovered oncogene, Herceptin Irene Ayako Uchida (1917–2013), Canadian geneticist and cytogeneticist. One of the first