| 单词 | dimorphism |
| 例句 | So a dimorphism tends to develop in couples when two people are trying to raise a child. Kyle Pruett on Fatherhood 2012-07-23T11:00:00Z Sexual dimorphism – the actual difference between the appearances of the male and the female – is a separate area of enquiry. Fancy that: the golden age of the sexy geeky leading male 2012-07-27T21:59:00Z Differences in body size between females and males of a species, a phenomenon called sexual size dimorphism, correlate with social structure. The Theory That Men Evolved to Hunt and Women Evolved to Gather Is Wrong 2023-10-17T04:00:00Z Sexual dimorphism is seen in this phylum, and embryonic development includes multiple larval stages. Fundamentals of Biology 2015-01-01T00:00:00Z Because natural selection is limited to sexual dimorphism. Biology for AP Courses 2022-06-09T00:00:00Z “They have found that Rosetta stone fossil that allows us to really confirm these theories about sexual dimorphism,” Bicknell says. Sex Life of One of Earth’s Earliest Animals Exposed 2022-06-03T04:00:00Z The hunt for genetic explanations above social linkages “reinforces the belief that … biological dimorphism drives a lot of illnesses,” she says. Critics say a childhood asthma study unethically withheld care—and see a troubling trend 2021-08-12T04:00:00Z In species with pronounced size dimorphism, larger males compete with one another for access to females, and among the great apes larger males socially dominate females. The Theory That Men Evolved to Hunt and Women Evolved to Gather Is Wrong 2023-10-17T04:00:00Z Sexual dimorphism is the predominant sexual strategy in this phylum. Fundamentals of Biology 2015-01-01T00:00:00Z Sexual dimorphism varies widely among species, of course, and some species are even sex-role reversed. Biology for AP Courses 2022-06-09T00:00:00Z Many stick insects display extreme sexual dimorphism, with females unrecognizable from their male companions. He Was a Stick, She Was a Leaf; Together They Made History 2020-12-01T05:00:00Z Hunt had been focusing on fossil ostracods – one of the few taxa where sexual dimorphism can be readily identified in the fossil record. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Low sexual size dimorphism is characteristic of egalitarian and monogamous species. The Theory That Men Evolved to Hunt and Women Evolved to Gather Is Wrong 2023-10-17T04:00:00Z Its degree of sexual dimorphism was less than earlier species, with males being 20 to 30 percent larger than females, which is close to the size difference seen in our species. Fundamentals of Biology 2015-01-01T00:00:00Z Species are sorted left to right based on shape dimorphism, with more extreme dimorphism plotted towards the right and in warmer colours. High male sexual investment as a driver of extinction in fossil ostracods 2018-04-10T04:00:00Z The Dodo and Solitaire both exhibited strong sexual dimorphism: male Solitaires weighed nearly 40% more than females. Pigeons and Doves 101 2018-04-08T04:00:00Z It turns out that sexual dimorphism correlates extremely well with increased extinction rate, with more than 99 percent of models correlating the two. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Modern humans have low sexual size dimorphism compared with the other great apes. The Theory That Men Evolved to Hunt and Women Evolved to Gather Is Wrong 2023-10-17T04:00:00Z For example, sexual dimorphism was more exaggerated than in modern humans. Fundamentals of Biology 2015-01-01T00:00:00Z Lande, R. Sexual dimorphism, sexual selection, and adaptation in polygenic characters. High male sexual investment as a driver of extinction in fossil ostracods 2018-04-10T04:00:00Z Spring, S., Lerch, J. P. & Henkelman, R. M. Sexual dimorphism revealed in the structure of the mouse brain using three-dimensional magnetic resonance imaging. Kctd13 deletion reduces synaptic transmission via increased RhoA 2017-10-31T04:00:00Z But it’s not sexual dimorphism itself that’s the problem – it’s the type of sexual dimorphism. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z The authors speculate that a preference for sexual dimorphism could arise from processing lots of diverse faces in a densely populated environment. Neuroscience: The aesthetic brain : Nature : Nature Publishing Group 2015-10-06T04:00:00Z Reproductive strategies include sexual dimorphism, hermaphroditism, and serial hermaphroditism. Fundamentals of Biology 2015-01-01T00:00:00Z Species attributes used in the analysis: dimorphism, shape dimorphism, occupancy, and family membership. High male sexual investment as a driver of extinction in fossil ostracods 2018-04-10T04:00:00Z At present we do not even know the extent of sexual dimorphism in the species — would a male skeleton be much larger and more H. erectus-like? Human evolution: Small remains still pose big problems 2014-10-21T04:00:00Z Unbeknownst to our K. cushmani, this gender difference in body shape — known as sexual dimorphism — marked him and his kind for failure. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Sexual dimorphism is slight or just about absent in some hornbills, but well developed in others. The Splendid and Remarkable Anatomy of Hornbills 2014-04-22T12:30:38Z Sexual dimorphism is seen in this class of animals. Fundamentals of Biology 2015-01-01T00:00:00Z This ‘no sexual dimorphism, thus no sexual selection’ thing keeps on coming up at the moment and it’s utterly erroneous. Dinosaurs and their exaggerated structures : species recognition aids, or sexual display devices? 2013-04-22T01:15:00.783Z Sexual dimorphism and differential niche utilization in birds. Kea, Kaka, Kakapo 2013-03-02T21:15:00.227Z Sexual dimorphism is a result of males and females diverging down different evolutionary paths through selection processes, such as competition to reproduce. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Sexual dimorphism is extreme in some species, with the males of some being as much as 66% larger than the females. The Splendid and Remarkable Anatomy of Hornbills 2014-04-22T12:30:38Z Sexual dimorphism is pronounced in body size as well as nose shape. The amazing swimming Proboscis monkey (part I) 2012-11-30T12:45:00.210Z Firstly, it’s often impossible to be sure that sexual dimorphism truly is absent in fossil animals: the sample sizes we’re working with are frequently just not good enough. Dinosaurs and their exaggerated structures : species recognition aids, or sexual display devices? 2013-04-22T01:15:00.783Z Sex dimorphism and individual variation within a single lineage seems to be the best explanation. Kenyan Fossils Rekindle Debate over Early Human Diversity 2012-08-10T14:17:24.517Z Ostracods’ message to us is that sexual dimorphism can be a major risk factor for extinction. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z In a few forms an interesting reversal of conditions has been found in that the eggs instead of the spermatozoa show the characteristic dimorphism. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Remarks.—Most measurements show a sexual dimorphism in this subspecies. An Annotated Check List of the Mammals of Michoac?n, M?xico 2012-03-24T02:00:18.660Z It may or may not be coincidental that giant petrels are unusual among petrels in exhibiting strong sexual dimorphism – perhaps the strongest dimorphism reported in any seabird. Living the pelagic life: of oil, enemies, giant eggs and telomeres (petrels part II) 2012-03-14T15:15:00.213Z However, sexual dimorphism is difficult or impossible to detect in members of some other ornithodiran lineages. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z The next step was to figure out what correlation, if any, existed between sexual dimorphism and how quickly species became extinct. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Sexual dimorphism in the position of the scar is characteristic of some snakes but is minimal in cottonmouths. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z 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 Ontogenetic change and sexual dimorphism in shape, color, and markings of head and neck. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z It has been argued that sexual dimorphism is present in the domes of some pachycephalosaurs and in the frill and horn shapes of such ceratopsians as Protoceratops and Agujaceratops. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z Does this mean the same applies to other taxa that show sexual dimorphism? When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Another litter of five young measured by Richard S. Funk were larger, and differences in the proportions of the tail length and snout-vent length suggest the sexual dimorphism found in larger individuals. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Moreover, it is evident that we have in the animal kingdom two kinds of dimorphism. On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z The total variation and sexual dimorphism are analyzed in table 3. A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America) 2011-09-25T02:00:14.967Z Signal trait sexual dimorphism and mutual sexual selection in Drosophila serrata. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z There are conflicting theories about whether sexual dimorphism is a good plan for a species. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z No sexual dimorphism or geographical variation occurs in these characters. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z As much as sexual dimorphism, the phenomena of polymorphism show the enormous influence exerted by external forces upon correlated variation of the parts during development, and in this way upon the final structure. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Sexual dimorphism is evident in all species and subspecies of Conophis. A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America) 2011-09-25T02:00:14.967Z Quantitative aspects of relative growth and sexual dimorphism in Protoceratops. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z The study showed that extinction rates in ostracods with the most pronounced sexual dimorphism of this type were 10 times higher than those with the least pronounced dimorphism. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Two phenomena interfere with the ready availability of the characters of form for classificatory ends—dimorphism and multiformity. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Sexual dimorphism in still another way reveals the intimate interactions existing between all the parts of an organism in every stage of development. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Otherwise, there is little sexual dimorphism in these snakes. A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America) 2011-09-25T02:00:14.967Z Purported sexual dimorphism in Protoceratops andrewsi, with the 'male' above, and 'female' below. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z Sexual dimorphism describes these physical — or morphological — differences between males and females of the same species. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z It is comparatively rare in hermaphrodite flowers for self-fertilization to occur, and the various forms of dichogamy, dimorphism and trimorphism are fitted to prevent this. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" 2011-04-03T02:00:20.883Z Finally, I have a little to say about the sexual dimorphism that occurs so generally in the animal kingdom. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Sexual dimorphism is evident in the number of subcaudals; there are, on the average, fewer subcaudals in females than in males of each subspecies. A Revision of Snakes of the Genus Conophis (Family Colubridae, from Middle America) 2011-09-25T02:00:14.967Z Regarding sexual dimorphism in extant ungulates, see our paper – we have some discussion of dimorphic horn morphology in bovids. Did dinosaurs and pterosaurs practise mutual sexual selection? 2012-01-05T15:45:07.957Z And this doesn’t apply just to morphological specialization – like sexual dimorphism – but specialization generally: in habitat, geographic range, maturation age, behavior, and environmental tolerance. When evolution’s path leads to a dead end 2018-06-08T04:00:00Z Find also the breathing pores along the sides of the abdomen.Unlikeness between male and female is called "sexual dimorphism." A Guide for the Study of Animals 2011-01-18T03:00:14.913Z In the British Museum I noticed one male specimen of Siagonium in an intermediate condition, so that the dimorphism is not strict. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z This is a good example of "dimorphism," as it is termed. An Australian Bird Book A Pocket Book for Field Use 2010-12-31T03:00:10.497Z “Sex chromosomes and the evolution of sexual dimorphism.” Evolving Sexual Tensions 2010-03-30T22:30:00Z More than most faces, his had a dimorphism, a kind of split face. Spotlight | Greenwich: Offering Face Time With History 2010-02-20T00:49:00Z Name some animal in which parthenogenesis commonly takes place.What is sex dimorphism? A Guide for the Study of Animals 2011-01-18T03:00:14.913Z Mr. MacLachlan informs me of another case of dimorphism occurring in several species of Agrion in which a certain number of individuals are found of an orange colour, and these are 364invariably females. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z One of the most interesting features of ant-societies is the dimorphism or polymorphism that may often be seen among the workers, the same species being represented by two or more forms. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" “Sex chromosomes and the evolution of sexual dimorphism: lessons from the genome.” Evolving Sexual Tensions 2010-03-30T22:30:00Z Absence of sexual dimorphism in the Bell Vireo obviously suggests that behavioral criteria are used by the birds in sex-recognition. Natural History of the Bell Vireo, Vireo bellii Audubon In insects with more than one brood in the year, seasonal dimorphism is often seen, and the differences are sometimes appropriate to the altered condition of the environment as the seasons change. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6 "Cockaigne" to "Columbus, Christopher" These characters absent in the lowest classes—Brilliant colours—Mollusca—Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity—Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z Some instances might be noted, not without interest, in which the facts of dimorphism or polymorphism have not been satisfactorily proved, but final judgment is held in suspense until suspicion is replaced by conviction. Fungi: Their Nature and Uses It is perhaps owing to this dimorphism that the family is able to show a very large number of natural hybrids. The plant-lore & garden-craft of Shakespeare Absence of sexual dimorphism suggests that behavioral criteria are used by the birds in sex-recognition; the male is dominant and the female is subordinate. Natural History of the Bell Vireo, Vireo bellii Audubon The first hatching, that of the normal egg, makes the Meloid go through the larval dimorphism of the Anthrax and the Leucospis. The Glow-Worm and Other Beetles Pinus is also peculiar in the dimorphism of shoots and leaves and in their constant interrelations with the diclinous flowers. The Genus Pinus Such a condition is called dimorphism; those minerals which crystallise in three systems are said to be trimorphous. The Chemistry, Properties and Tests of Precious Stones In the case of the flower, where similar diversity of form occasionally exists, the term dimorphism is used. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants It is only by breeding the two insects that it can be determined whether this is a case of a co-existing variety or of dimorphism. Contributions to the Theory of Natural Selection A Series of Essays He also inquired into the origin of variability, and held that it can be elucidated by seasonal dimorphism. Lamarck, the Founder of Evolution His Life and Work In 1832 he investigated the dimorphism of arsenious acid and antimony oxide. Scientific American Supplement, No. 365, December 30, 1882 The butterflies of the spring brood differ slightly but constantly from their summer offspring, affording examples of what is called seasonal dimorphism. The Life-Story of Insects Morgan, however, also states that a case of true sexual dimorphism arose as a mutation in his cultures of Drosphilia. Hormones and Heredity The distinctive character therefore of dimorphism is this, that the union of these distinct forms does not produce intermediate varieties, but reproduces the distinct forms unchanged. Contributions to the Theory of Natural Selection A Series of Essays He concluded from his studies in seasonal dimorphism, “that differences of specific value can originate through the direct action of external conditions of life only.” Lamarck, the Founder of Evolution His Life and Work All of them may be characterized by the general term of dimorphism. Species and Varieties, Their Origin by Mutation In tropical countries where instead of an alternation of winter and summer, alternate dry and rainy seasons prevail, somewhat similar seasonal dimorphism has been observed among many butterflies. The Life-Story of Insects Bateson offers no explanation of this, but it obviously suggests that some trace of the original dimorphism of the sheep in this character was retained in both horned and hornless breeds. Hormones and Heredity Polymorphism or dimorphism.—By this term I understand the co-existence in the same locality of two or more distinct forms, not connected by intermediate gradations, and all of which are occasionally produced from common parents. Contributions to the Theory of Natural Selection A Series of Essays Professor Asa Gray remarks with respect to this plant: "the tendency to dimorphism, of which there are traces, or perhaps rather incipient manifestations in various portions of the genus, is most marked in G. aggregata." The Different Forms of Flowers on Plants of the Same Species The bearing of the phenomena of dimorphism upon the principles of evolution formulated by Lamarck, and modified by his followers to constitute Neo-Lamarckianism, remains to be considered. Species and Varieties, Their Origin by Mutation I will describe this double stage of the organism by the phrase 'larval dimorphism.' The Life of the fly; with which are interspersed some chapters of autobiography But as pointed out above, selection cannot explain the dimorphism in either case. Hormones and Heredity It is evidently only by direct evidence of the two forms breeding separately that this can be distinguished from dimorphism. Contributions to the Theory of Natural Selection A Series of Essays Professor Gray informs me that in another species, G. coronopifolia, belonging to the same section of the genus, he can see no sign of dimorphism. The Different Forms of Flowers on Plants of the Same Species DARWIN, C., on Lepus magellanicus. -on the wild potato. -dimorphism in the polyanthus and primrose. The Variation of Animals and Plants under Domestication — Volume 2 The fact of both the forms presenting the same case of dimorphism is very curious. More Letters of Charles Darwin — Volume 2 The Mendelian merely sees a relation of the character to sex, but overlooks entirely the question of the dimorphism in the original species from which the domesticated breeds are descended. Hormones and Heredity On the other hand, intercrossing without producing an intermediate race is a test of dimorphism. Contributions to the Theory of Natural Selection A Series of Essays This gives a narrow impression of Darwin's interest in dimorphism. More Letters of Charles Darwin — Volume 1 In Siagonium we have a case of dimorphism, for the males can be divided into two sets, differing greatly in the size of their bodies and in the development of their horns, without intermediate gradations. The Descent of Man I have been glad to hear of your cases appearing like incipient dimorphism. More Letters of Charles Darwin — Volume 2 He also discusses the case of Abraxas grossulariata and its variety lacticolor, and other cases of sex-linked heredity, apparently with the idea that all such cases are similar to those of sexual dimorphism. Hormones and Heredity I have sent my paper on dimorphism in Primula to the Linn. Life and Letters of Charles Darwin — Volume 2 It is this which makes me so much interested with dimorphism, etc. More Letters of Charles Darwin — Volume 1 Mr. MacLachlan informs me of another instance of dimorphism in several species of Agrion, in which some individuals are of an orange colour, and these are invariably females. The Descent of Man As you so kindly helped me before on dimorphism, will you forgive me begging for a little further information, if in your power to give it? More Letters of Charles Darwin — Volume 2 There are, also, cases of dimorphism and trimorphism, both with animals and plants. The Origin of Species by means of Natural Selection, 6th Edition Wolfgang Ostwald has produced experimentally, through variation of temperature, dimorphism of form in Daphnia. Darwin and Modern Science Any member of the Lythraceae raised from seed ought to be well looked after for dimorphism. More Letters of Charles Darwin — Volume 1 These characters absent in the lowest classes—Brilliant colours—Mollusca —Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity—Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man I have long thought that such variations afforded the basis for the development of dimorphism. More Letters of Charles Darwin — Volume 2 As yet I know of no case of dimorphism in flowers which are very irregular; such flowers being apparently always sufficiently visited and crossed by insects. More Letters of Charles Darwin — Volume 2 The experiments of Dorfmeister, Weismann, Merrifield, Standfuss, and Fischer, on seasonal dimorphism and the aberration of colour in butterflies have so often been discussed in biological literature that a short reference to them will suffice. Darwin and Modern Science I have posted to you copies of my papers on dimorphism. More Letters of Charles Darwin — Volume 1 These characters are absent in the lowest classes—Brilliant colours— Mollusca—Annelids—Crustacea, secondary sexual characters strongly developed; dimorphism; colour; characters not acquired before maturity— Spiders, sexual colours of; stridulation by the males—Myriapoda. The Descent of Man I am anxious about this, because if it should prove so, it will show that all plants with longer and shorter or otherwise different anthers will have to be examined for dimorphism. More Letters of Charles Darwin — Volume 2 In 1862 Darwin attempted to explain the existence of two very different sets of stamens in these plants as a case of dimorphism, somewhat analogous to the state of things in Primula. More Letters of Charles Darwin — Volume 2 By seasonal dimorphism is meant the fact that species may appear at different seasons of the year in a somewhat different form or colour. Darwin and Modern Science Gartner found the common primrose and cowslip very difficult to cross, but he knew nothing on dimorphism. More Letters of Charles Darwin — Volume 2 I have now got dimorphism in structure in eight natural orders just like Primula. More Letters of Charles Darwin — Volume 2 |
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