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单词 alternation of generations
例句 alternation of generations
A variety of algal life cycles exists, but the most complex is alternation of generations, in which both haploid and diploid stages involve multicellularity. Fundamentals of Biology 2015-01-01T00:00:00Z
There are three main categories of life cycles: diploid-dominant, demonstrated by most animals; haploid-dominant, demonstrated by all fungi and some algae; and alternation of generations, demonstrated by plants and some algae. Concepts of Biology 2013-04-25T00:00:00Z
There are three main categories of life cycles: diploid-dominant, demonstrated by most animals; haploid-dominant, demonstrated by all fungi and some algae; and the alternation of generations, demonstrated by plants and some algae. Biology for AP Courses 2022-06-09T00:00:00Z
Many protists have sexual life cycles in which they switch between a diploid and a haploid phase, a process known as alternation of generations. Miller & Levine Biology 2018-01-01T00:00:00Z
This new discovery allows the possibility that alternation of generations was established very early in, or even before, the evolution of earliest land plants. Spore heroes: unlocking the life-cycle secrets of the earliest land plants 2018-05-24T04:00:00Z
Certain other organisms perform alternation of generations in which both the haploid and diploid forms look the same. Fundamentals of Biology 2015-01-01T00:00:00Z
The third life-cycle type, employed by some algae and all plants, is called alternation of generations. Concepts of Biology 2013-04-25T00:00:00Z
In alternation of generations, both haploid dominant and diploid dominant stages alternate, as in plants. Biology for AP Courses 2022-06-09T00:00:00Z
This shift between the haploid phase and the diploid phase is known as the alternation of generations. Miller & Levine Biology 2018-01-01T00:00:00Z
All plants maintain this dual life cycle, called “the alternation of generations“. Ferns Stole Rare Gene From Unlikely Source 2014-05-06T13:45:46Z
The red algae life cycle is an alternation of generations. Fundamentals of Biology 2015-01-01T00:00:00Z
Most species multiply by asexual and sexual reproductive cycles, and display an alternation of generations. Concepts of Biology 2013-04-25T00:00:00Z
In alternation of generations, both haploid dominant and diploid dominant stages alternate, as in plants. Biology for AP Courses 2022-06-09T00:00:00Z
Nevertheless insects offer, in their metamorphoses, a phenomenon not altogether dissimilar, and give a clue to the manner in which alternation of generations may have originated. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z
The alternating activity of these two produces the alternation of generations. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z
Four major adaptations are found in all terrestrial plants: the alternation of generations, a sporangium in which the spores are formed, a gametangium that produces haploid cells, and apical meristem tissue in roots and shoots. Fundamentals of Biology 2015-01-01T00:00:00Z
Most plants exhibit alternation of generations, which is described as haplodiplontic: the haploid multicellular form known as a gametophyte is followed in the development sequence by a multicellular diploid organism, the sporophyte. Concepts of Biology 2013-04-25T00:00:00Z
In alternation of generations, both haploid dominant and diploid dominant stages alternate, as in fungi. Biology for AP Courses 2022-06-09T00:00:00Z
If this idea is correct, it shows how the remarkable phenomenon, 77known as alternation of generations, may have originated. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z
There is thus in all the Basidiales an alternation of generations, obscured, however, by the apogamous transition from the gametophyte to sporophyte. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z
Most plants exhibit alternation of generations, which is described as haplodiplodontic: the haploid multicellular form, known as a gametophyte, is followed in the development sequence by a multicellular diploid organism: the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z
The life cycle of bryophytes and pterophytes is characterized by the alternation of generations. Concepts of Biology 2013-04-25T00:00:00Z
Although all plants utilize some version of the alternation of generations, the relative size of the sporophyte and the gametophyte and the relationship between them vary greatly. Biology for AP Courses 2022-06-09T00:00:00Z
There are, however, some flies which have viviparous larvæ, and thus offer a typical case of alternation of generations. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z
Life-history always very simple, no well-marked alternation of generations; basidium borne directly on the mycelium. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z
Unlike land plants, Charales do not undergo alternation of generations in their lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z
In many species and genera the life-history is complex, illustrating what is called the alternation of generations. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z
Species with alternation of generations have both haploid and diploid multicellular organisms as part of their life cycle. Biology for AP Courses 2022-06-09T00:00:00Z
Many instances of this second form of dimorphism have been described under the name of alternation of generations. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z
Of a locomotory one?What is meant by the expression "alternation of generations"? A Guide for the Study of Animals 2011-01-18T03:00:14.913Z
The moss lifecycle follows the pattern of alternation of generations as shown in Figure 6. Fundamentals of Biology 2015-01-01T00:00:00Z
Naked hydrozoa which reproduce their kind by means of buds or eggs, or by fission, without exhibiting the phenomena of alternation of generations. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z
In alternation of generations both haploid dominant and diploid dominant stages alternate, as in plants. Biology for AP Courses 2022-06-09T00:00:00Z
The phylogenetic significance of the alternation of generations consists in its representing a transition stage from the unicellular to the simpler multicellular and from the latter to the more complex multicellular plants. A Mechanico-Physiological Theory of Organic Evolution
Which animals are likely to develop alternation of generations, sedentary ones or locomotory ones? A Guide for the Study of Animals 2011-01-18T03:00:14.913Z
The lifecycle of bryophytes and pterophytes is characterized by the alternation of generations, like gymnosperms and angiosperms; what sets bryophytes and pterophytes apart from gymnosperms and angiosperms is their reproductive requirement for water. Fundamentals of Biology 2015-01-01T00:00:00Z
Steenstrup has given to these curious phenomena, many other cases of which occur among the lower animals, and to which he first called attention, the name of alternations of generations. The Beauties of Nature and the Wonders of the World We Live In
This is in fact a true virgin reproduction, and directly comparable to the alternation of generations observed in the jelly fishes, in Salpa, and certain intestinal worms. Our Common Insects A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses
Thus alternation of generations in cells exists, because the successive generations become more and more complicated at each succeeding period. A Mechanico-Physiological Theory of Organic Evolution
This fact is the more interesting when compared with the alternation of generations which takes place among the lower animals. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
Other protists have multicellular stages in both haploid and diploid forms, a strategy called alternation of generations that is also used by plants. Fundamentals of Biology 2015-01-01T00:00:00Z
Kölliker, in 1872, compared the evolution of species with the processes which we can observe in the individual life in cases of alternation of generations. Evolution in Modern Thought
But Mr Huxley shews, by observation and experiment on Salpa and Pyrosoma, that each has independent powers of reproduction, and his facts are conclusive against the theory of 'alternation of generations.' Chambers's Edinburgh Journal, No. 434 Volume 17, New Series, April 24, 1852
But in the latter case the characteristic of adaptation is again lost in the course of the phylogeny and alternation of generations follows then without regard to the season. A Mechanico-Physiological Theory of Organic Evolution
No division within the generation could possibly produce an alternation of generations. Kinship Organisations and Group Marriage in Australia
The life cycle of a gymnosperm involves alternation of generations, with a dominant sporophyte in which the female gametophyte resides, and reduced gametophytes. Fundamentals of Biology 2015-01-01T00:00:00Z
There is then an alternation of generations, but there are not two sexual generations. Thomas Henry Huxley; A Sketch Of His Life And Work
According to M. Lichtenstein, all previous observations have been made only on aphides of this third type; and he maintains that every species in the whole family really undergoes an analogous alternation of generations. Falling in Love With Other Essays on More Exact Branches of Science
The alternation of generations, which is perhaps most clear and typical in the case of the fern, becomes less distinctly marked in the plants of higher organization and type. Scientific American Supplement, No. 531, March 6, 1886
Kolliker, in 1872, compared the evolution of species with the processes which we can observe in the individual life in cases of alternation of generations. Darwin and Modern Science
Terrestrial plants also have evolved alternation of generations. Fundamentals of Biology 2015-01-01T00:00:00Z
Lycophytes follow the pattern of alternation of generations seen in the bryophytes, except that the sporophyte is the major stage of the lifecycle. Fundamentals of Biology 2015-01-01T00:00:00Z
This enabled us to form a conception as to the essence of true alternation of generations, in which generations containing single and double chromosomes alternate with one another. Darwin and Modern Science
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