New PDF release: A History of Genetics

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, performed the paintings that laid the rules of recent, chromosomal genetics. the thrill of these instances, whilst the full box of genetics used to be being created, is captured during this ebook, written in 1965 by way of a kind of current in the beginning. His account is likely one of the few authoritative, analytic works at the early heritage of genetics. This appealing reprint is observed by means of an internet site, delivering full-text models of the main papers mentioned within the booklet, together with the world's first genetic map.

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Following Weismann and others, de Vries rejected the second of these views, but he retained the first. This might have led to an interpretation like Weismann’s, but de Vries added an essential point, namely, that the units (which he called “pangens”) are each concerned with a single character, and that these units may be recombined in various ways in the offspring. This was a clear approach to the Mendelian point of view, and helps to explain why, eleven years later, de Vries was one of the three men who discovered and appreciated Mendel’s paper.

The only two halves seemed to him to give a clue as to the nature of heredity— a point to which he returned again and again. This idea seems to have been one source of the reduplication hypothesis. 42 A H I ST O RY OF G EN ET IC S strong argument in favor of the XY system as the sex-determining mechanism was that it gave a simple way of getting the 1 : 1 sex ratio. But it was known that other situations occur in which fertilized eggs give rise only to females, and unfertilized eggs give rise to either sex.

Gesellsch. January 25, 1900), the manuscript having been received December 22, 1899. The same conclusion was also reached by de Vries in 1899. ” This was the first printed indication that anyone had understood any part of Mendel’s work. In connection with this study, Correns grew hybrids of maize and of peas through several generations, and arrived at the interpretation (that is, the Mendelian one) in 1899. ” Correns (in a letter quoted by Roberts) compared his own and Mendel’s solution of the problem: “.

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A History of Genetics by A.H. Sturtevant

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