Download e-book for iPad: A History of Genetics by A.H. Sturtevant

By A.H. Sturtevant

ISBN-10: 0879696079

ISBN-13: 9780879696078

Within the small Fly Room at Columbia college, T.H. Morgan and his scholars, A.H. Sturtevant, C.B. Bridges, and H.J. Muller, conducted the paintings that laid the principles of contemporary, chromosomal genetics. the thrill of these instances, while the entire box of genetics was once being created, is captured during this e-book, written in 1965 by way of a type of current before everything. His account is likely one of the few authoritative, analytic works at the early heritage of genetics. This beautiful reprint is observed through an internet site, supplying full-text types of the foremost papers mentioned within the e-book, together with the world's first genetic map.

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The only one described in any detail, having to do with the color of the seed coat in peas, seems to have involved the carrying of a dominant gene for color pattern in a plant which also had a recesssive that prevented all color, with the result that the F1 did not resemble either parent. This type of situation later became familiar but seemed then to contradict the Mendelian scheme. Erich von Tschermak (1871–1962) was a grandson of Fenzl, under whom Mendel studied systematic botany and microscopy at Vienna.

The possibility that linkage might result from genes lying in the same chromosome had been suggested by Lock in 1906, in his elaboration of de Vries’ idea that exchange of mate* A more detailed account of the early laboratory studies, with names and dates, may be found in my biography of Morgan (Sturtevant, 1959). * Morgan then applied the chiasmatype hypothesis of Janssens to the results and postulated that linkage is due to the genes concerned lying in the same chromosome pair. The term crossing over was introduced, and it was concluded that closely linked genes lie close to each other, more loosely linked ones farther apart.

The F1 had colored flowers and seeds and was hoary. In F2 he expected to find many types, resulting from independent segregation of three pairs of genes, but actually recovered only the two parental combinations, in the ratio 3 : 1. He suggested that the flower color and seed color might be due to the same pair of genes, but interpreted the relation between color and hoariness as being due to the absence of recombination between two different pairs of genes. He knew of the existence of smooth strains with colored flowers and of hoary strains with white flowers, which confirmed the view that there were two pairs of genes.

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A History of Genetics by A.H. Sturtevant

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