Stebbins , George Ledyard

Stebbins , George Ledyard
(1906–) American geneticist
Born in Lawrence, New York, Stebbins studied biology at Harvard where he obtained his PhD in 1931. After working at Colgate University he moved to Berkeley in 1935 and to Davis in 1950, where he established the department of genetics, holding the chair until his retirement in 1973.
In his Variation and Evolution in Plants (1950) Stebbins was the first to apply the modern synthesis of evolution, as expounded by Julian Huxley, Ernst Mayr, and others to plants. In collaboration with Ernest Babcock, Stebbins also studied polyploidy – the occurrence of three or more times the basic (haploid) number of chromosomes. When an artificial means of inducing polyploidy was developed Stebbins applied it to wild grasses and in 1944 managed to establish an artificially created species in a natural environment. He also used the technique to double the chromosome number of sterile interspecific hybrids and in so doing created fertile polyploid hybrids. Fertility tends to be restored in polyploid hybrids because the two different sets of chromosomes from the parent species will each have an identical set to pair with at meiosis and so the formation of gametes is not disturbed. Polyploids have proved extremely useful in plant-breeding work. Knowledge of naturally occurring polyploid systems has also helped greatly in understanding the relationships and consequently in classifying difficult genera such asTaraxacum (the dandelions).
Stebbins also studied gene action and proposed that mutations that result in a change in morphology act by regulating the rate of cell division in specific areas of the plant.

Scientists. . 2011.

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  • Stebbins, George Ledyard, Jr. — ▪ 2001       American botanist and geneticist (b. Jan. 6, 1906, Lawrence, N.Y. d. Jan. 19, 2000, Davis, Calif.), was a pioneer in the field of evolutionary biology and the first scientist to artificially produce a new species of plant that was… …   Universalium

  • George Ledyard Stebbins — Nacimiento 6 de enero de 1906 Fallecimiento 19 de enero de 2000 Residencia EE.UU. Nacionalidad estadounidense …   Wikipedia Español

  • George Ledyard Stebbins — Pour les articles homonymes, voir Stebbins. George Ledyard Stebbins est un généticien et un botaniste américain, né le 6 janvier 1906 à Lawrence (Comté de St. Lawrence) et mort le 19 janvier 2000. Il est le fils de George Ledyard Stebbins et… …   Wikipédia en Français

  • George Ledyard Stebbins — (* 6. Januar 1906 in Lawrence, New York; † 19. Januar 2000 in Davis, Kalifornien) war ein US amerikanischer Botaniker, Genetiker und Evolutionsbiologe. Er war einer der Architekten der Synthetischen Evolutionstheorie, der den Teilbereich der… …   Deutsch Wikipedia

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  • George Stebbins — ist der Name folgender Personen: George Ledyard Stebbins (1906–2000), US amerikanischer Botaniker, Genetiker und Evolutionsbiologe George Waring Stebbins (1869–1930), US amerikanischer Organist und Komponist Diese Seite ist eine …   Deutsch Wikipedia

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