Wilhelm Hofmeister demonstrated that alternation of generations is a feature that unites plants, and published this result in 1851 ( see plant sexuality ).
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He came up with biophysical explanations on phenomena like phototaxis and geotaxis, and also discovered the alternation of generations in the plant life cycle.
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In those algae which have alternation of generations, the sporophyte and gametophyte are separate independent organisms, which may or may not have a similar appearance.
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In seed plants, which exhibit alternation of generations, the female and male parts are both included within the sporophyte sex organ of a single organism.
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As taller and more complex plants evolved, modifications in the alternation of generations evolved; in the Paleozoic era progymnosperms reproduced by using spores dispersed on the wind.
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Presently, the term " alternation of generations " is almost exclusively associated with the life cycles of plants, specifically with the alternation of haploid gametophytes and diploid sporophytes.
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The animal's rapid growth and this alternation of generations means that the population can build up rapidly when there is a plentiful food supply such as a ctenophores.
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He worked on a great many subjects, including cephalopods, but also in genetics, where he discovered the principle of the alternation of generations in some parasitic worms in 1842.
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The detailed study of reproductive structures in plants led to the discovery of the alternation of generations, found in all plants and most algae, by the German botanist Wilhelm Hofmeister.
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All land plants have a life cycle with an alternation of generations between a diploid sporophyte and a haploid gametophyte, but in all non-vascular land plants the gametophyte generation is dominant.
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