US evolutionary and ecological biologist G Michael T. Gabbett (born 1974), Australian medical geneticist and academic, known for describing Temple–Baraitser syndrome and sesquizygotic twinning Fred Gage (born 1950), US neuroscientist, studies of neurogenesis and neuroplasticity of the adult brain Joseph G. Gall (born 1928), distinguished US cell biologist, chromosomes, created in situ hybridization André Gallais, French specialist in quantitative genetics and breeding methods theory Francis Galton (1822–1911), British geneticist, eugenicist, statistician George Gamow (1904–1968), Ukrainian-born American polymath, proposed genetic code concept Eldon J. Gardner (1909–1989), US professor of genetics in Utah, described Gardner's syndrome Alan Garen (1926–2022), US, early molecular geneticist, nonsense triplets terminating transcription Archibald Garrod (1857–1936), English physician, pioneered inborn errors, founded biochemical genetics Stan Gartler (born 1923), US human geneticist, G6PD as X-linked marker, clonality of cancer, HeLa cells contaminating cell lines Lihadh Al-Gazali (born 1948), Iraqi geneticist, research on congenital disorders in the United Arab Emirates Luigi Gedda (1902–2000), Italian geneticist best known for his fascination with twin studies Walter Gehring (1939–2014), Swiss, developmental genetics of Drosophila, discovered homeobox Park S. Gerald (1921–1993), US medical geneticist, research on hemoglobins and chromosomes James L. German, US medical geneticist and cytogeneticist, pioneer on Bloom syndrome Walter Gilbert (born 1932), US biochemist and molecular biologist, Nobel Prize-winner, entrepreneur H. Bentley Glass (1906–2005), US geneticist, provocative science theorizer, writer, science policy maker Salome Gluecksohn-Waelsch (1907–2007), German-born US co-founder of developmental genetics Richard Goldschmidt (1878–1958), German-American, integrated genetics, development, and evolution Joseph L. Goldstein (born 1940), US medical geneticist, Nobel Prize-winner on cholesterol Richard M. Goodman (1932–1989), US-Israeli clinical geneticist, pioneered Jewish genetic diseases Robert J. Gorlin (1923–2006), US oral pathologist, clinical geneticist, craniofacial syndrome expert Irving I. Gottesman (1930–2016), US behavioral geneticist, used twin studies to analyze schizophrenia Carol W. Greider (born 1961), US molecular biologist, Lasker Award and Nobel Prize for telomeres and telomerase Frederick Griffith (1879–1941), British medical officer who found transforming principle now called DNA Lyn R. Griffiths, distinguished Australian molecular geneticist known for her work in neurogenetics Clifford Grobstein (1916–1998), US scientist, bridged classical embryology and developmental biology Jean de Grouchy (1926–2003), French pioneer of clinical cytogenetics and karyotype–phenotype correlation Hans Grüneberg (1907–1982), British mouse geneticist and blood cell biologist Pierre-Henri Gouyon (born 1953), French biologist specializing in genetics and bioethics Elliot S. Goldstein, US geneticist at Arizona State University Alexander Gusev (scientist), human geneticist with a focus on oncogenomics H Ernst Hadorn (1902–1976), Swiss pioneer