Experiments in Plant Hybridization Mendel abridged

Experiments in Plant Hybridization Mendel abridged -...

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Experiments in Plant Hybridization (1865) by Gregor Mendel Read at the meetings of February 8th, and March 8th, 1865 English translation, source: MendelWeb (http://www.mendelweb.org/Mendel.html) [..] material removed by J.M. from original paper Introductory Remarks Experience of artificial fertilization, such as is effected with ornamental plants in order to obtain new variations in color, has led to the experiments which will here be discussed. The striking regularity with which the same hybrid forms always reappeared whenever fertilization took place between the same species induced further experiments to be undertaken, the object of which was to follow up the developments of the hybrids in their progeny.[…] That, so far, no generally applicable law governing the formation and development of hybrids has been successfully formulated can hardly be wondered at by anyone who is acquainted with the extent of the task, and can appreciate the difficulties with which experiments of this class have to contend. A final decision can only be arrived at when we shall have before us the results of detailed experiments made on plants belonging to the most diverse orders. […] The paper now presented records the results of such a detailed experiment. This experiment was practically confined to a small plant group, and is now, after eight years' pursuit, concluded in all essentials. Whether the plan upon which the separate experiments were conducted and carried out was the best suited to attain the desired end is left to the friendly decision of the reader. Selection of the Experimental Plants The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used, and thus in the case before us it cannot be immaterial what plants are subjected to experiment and in what manner such experiment is conducted. The selection of the plant group which shall serve for experiments of this kind must be made with all possible care if it be desired to avoid from the outset every risk of questionable results. The experimental plants must necessarily: 1. Possess constant differentiating characteristics 2. The hybrids of such plants must, during the flowering period, be protected from the influence of all foreign pollen, or be easily capable of such protection. 3. The hybrids and their offspring should suffer no marked disturbance in their fertility in the successive generations. Accidental impregnation by foreign pollen, if it occurred during the experiments and
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were not recognized, would lead to entirely erroneous conclusions. Reduced fertility or entire sterility of certain forms, such as occurs in the offspring of many hybrids, would render the experiments very difficult or entirely frustrate them. In order to discover the relations in which the hybrid forms stand towards each other and also towards their progenitors it appears to be necessary that all member of the series developed in each successive generations should be, without exception, subjected to observation. […] Some thoroughly distinct forms of this genus possess characters which are constant, and
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This note was uploaded on 10/05/2008 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas at Austin.

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Experiments in Plant Hybridization Mendel abridged -...

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