| 单词 | unisexual |
| 例句 | The study offers one of few examples of “unisexual reproduction” observed so far in wild mushrooms, although there are more and more examples from lab-based studies. Death cap mushroom’s unusual sex life may be key to its rapid spread 2023-02-02T05:00:00Z These include unisexual whiptail lizards and deadbeat cassowary moms, which abandon hatchlings to Dad’s care. Soon enough, women will run the world — and it will be a better place 2015-04-15T04:00:00Z Several Ambystoma species are unisexual – that is, they consist only of parthenogenetic females. Life and times of the wild Axolotl 2012-12-31T01:15:03.023Z Staminate and pistillate flowers variously disposed, some of the spikes often unisexual. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z The flowers spring in branching spadices from the axils of the leaves, and as the trees are unisexual it is necessary in cultivation to fertilize the female flowers by artificial means. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 9 "Dagupan" to "David" 2012-02-11T03:03:39.807Z Sun and Duke mycologist Joseph Heitman have described unisexual reproduction in detail in the single-celled fungus Cryptococcus, and researchers in Germany recently documented it in an edible species. Death cap mushroom’s unusual sex life may be key to its rapid spread 2023-02-02T05:00:00Z The short-stalked, bell-shaped flowers are unisexual, but staminate and pistillate are borne on the same plant; the latter are recognized by the swollen warty green ovary below the rest of the flower. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z How, then, are these animals able to avoid the problems otherwise associated with unisexual reproduction? Life and times of the wild Axolotl 2012-12-31T01:15:03.023Z Spikelets of a single perfect or unisexual or rudimentary flower, in jointed spikes, in pairs at each joint, mostly imbedded in the thick rhachis. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z Flowers monoecious or dioecious, unisexual, without a perianth, often in the form of cones, but never terminal on the main stem. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The spikelets are sometimes unisexual, and there are often six stamens. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z The flowers are unisexual, and strikingly epigynous, the perianth and stamens being attached to a bell-shaped prolongation of the receptacle above the ovary. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z It has narrow, short-stalked leaves and inconspicuous, apetalous, unisexual flowers borne in short spikes. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Flowers unisexual, racemose, spicate or capitate; calyx becoming fleshy or juicy in fruit. The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee 2012-04-12T02:00:30.140Z In the phenomena of unisexual generation we see that the larger organisms never reproduce themselves in the unisexual way, while the smaller organisms reproduce themselves with the greatest rapidity by this method. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z Spikelets unisexual, male and female in separate inflorescences or on different parts of the same inflorescence. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z The plants are trees or shrubs with simple leaves alternately arranged and small unisexual flowers generally arranged in catkins and pollinated by wind-agency. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z They consist of small fronds bearing naked unisexual flowers. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z If the margins of such a receptacle be developed upwards, the centre not developing, a concave receptacle is formed, which may partially or completely enclose a number of flowers that are generally unisexual. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Between these two extremes unisexual reproduction decreases while the size increases. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z These partial inflorescences are generally unisexual, the male often containing numerous flowers while the female flowers are solitary. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 8 "Ethiopia" to "Evangelical Association" 2011-03-05T03:00:24.537Z The plants of all the above classes have flowers furnished with both stamens and pistils; but in the next three the flowers are unisexual. Lives of Eminent Zoologists, from Aristotle to Linnæus with Introductory remarks on the Study of Natural History Polygamous, having some perfect and some unisexual flowers, 85. The Elements of Botany For Beginners and For Schools In unisexual flowers it is not uncommon to find vestiges of the undeveloped stamens in the form of filiform bodies or scales. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Alston’s observations were founded on what occurred in certain unisexual plants, such as Mercurialis, Spinach, Hemp, Hop and Bryony. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" Gonads not so restricted in position as in Oligochaets, and often more abundant; the individuals usually unisexual. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" The flowers are unisexual; the staminate are borne in spikes, each flower consisting of a central stamen which is surrounded by two scale-like perianth-leaves. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4 "Carnegie Andrew" to "Casus Belli" Not only the catkins but the plants themselves are unisexual, and, as is usual with the catkin-bearers, it is the male that is most ornamental. Trees and Shrubs for English Gardens When in the same plant there are unisexual flowers, both male and female, the plant is said to be monoecious, as in the hazel and castor-oil plant. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Such facts, taken in connection with abundant modern experience of what are called unnatural vices, only prove the universality of unisexual indulgence in all parts of the world and under all conditions of society. A Problem in Greek Ethics Being an inquiry into the phenomenon of sexual inversion The flowers are unisexual; the male blossoms have five stamens with sinuous anthers, the female have reniform stigmas, and an ovary with three large fleshy placentas. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" I will here just recall the fact that many plants, though hermaphrodite in structure, are unisexual in function;—such as those called by C. K. The Variation of Animals and Plants Under Domestication, Volume II (of 2) It must not be forgotten that the flowers are unisexual, i.e. those of one sex only are borne on a tree. Trees and Shrubs for English Gardens The flowers are unisexual; the fruit consists of hardened bracts with winged seeds. Austral English A dictionary of Australasian words, phrases and usages with those aboriginal-Australian and Maori words which have become incorporated in the language, and the commoner scientific words that have had their origin in Australasia In walnuts, as well as most other nuts, the male and female functions are performed by unisexual flowers of very different type and appearance. Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 In the genera Polytoca and Coix the spikelets are unisexual and the male and female spikelets are found in the same inflorescence, the female being below and the male being continuous with it. A Handbook of Some South Indian Grasses Abortion of the pistil, fruit, &c.—Traces of the carpels occur in many male flowers of unisexual plants, e.g. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants A few, like the Indian corn, have the flowers unisexual; the male flowers are at the top of the stem forming the “tassel,” and the female flowers lower down forming the ear. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses The starting-point of the class, however, and the position within it of apetalous families with frequently unisexual flowers, have provoked much discussion. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Emasculation and bagging was done at the beginning of anthesis, that is, when the first unisexual male catkins began to shed pollen. Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 The spikelets are all unisexual, spicate, the male and female spikelets are dissimilar, and are on the same or on different spikes. A Handbook of Some South Indian Grasses Structurally hermaphrodite flowers become unisexual by suppression, or are rendered incomplete by the non-development of one or more of their floral whorls. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants The flowers are unisexual; the female flowers are usually borne at the base of the inflorescence, and the male flowers above. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Dr. George W. Field, an expert authority, says the oysters of Europe are unisexual, but in America, they are double-sexed. The Evolution of Man Scientifically Disproved In 50 Arguments This stability and this absence of the splitting shown by varietal marks in the offspring of hybrids is one of the best proofs of unisexual unions. Species and Varieties, Their Origin by Mutation The flowers, which are produced in April, are small and yellow, unisexual, or each sex on a distinct plant. Hardy Ornamental Flowering Trees and Shrubs Again the difficulty experienced occasionally in getting vines, strawberries, &c., to set properly, may sometimes be accounted for by that inherent tendency which some plants possess of exchanging an hermaphrodite for a unisexual condition. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants Like the arrowhead, the flowers are unisexual, but borne on different plants. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Nevertheless, with most kinds it is necessary to take as much care to prevent crosses as with animals or unisexual plants; but with some plants, such as peas, this care is not necessary. The Variation of Animals and Plants under Domestication — Volume 2 Those of the circumference are ligulate and ordinarily unisexual, without stamens. Species and Varieties, Their Origin by Mutation This occurs in the genus Acropera, two species of which you assume to be unisexual, and so far as known represented by male individuals only. More Letters of Charles Darwin — Volume 2 Change from hermaphroditism to unisexuality.—Many flowers ordinarily hermaphrodite as to structure, become unisexual by the abortion or suppression of their stamens, or of their carpels, as the case may be. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants It would be a fine case of gradation between an hermaphrodite and unisexual condition. Life and Letters of Charles Darwin — Volume 2 I will merely recall the fact that many plants, though hermaphrodite in structure, are unisexual in function;—such as those called by C.K. The Variation of Animals and Plants under Domestication — Volume 2 But if, in fact, all hermaphrodites do occasionally intercross, the difference between them and unisexual species is, as far as function is concerned, very small. The Origin of Species by means of Natural Selection, 6th Edition |
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