Recent Progress in the Study of Variation, Heredity, and EvolutionDutton, 1916 - 336 頁 |
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常見字詞
ABAB acquired characters actual afforded animals and plants appearance arise Bateson behaviour biometry breeding true cells chapter colour conclusion contain correlation CR CR CR crossed curve Darwin definite described discontinuous distinct division dominant equal numbers evidence evolution example existence fact factors female fertilization flowers Francis Galton Galton gametes germ-cells give rise grains groups hereditary heredity heterozygote homozygote individual inheritance JOSEPH GOTTLIEB KÖLREUTER Karl Pearson kind Kölreuter Lamarck large number male Mendel's law Mendelian Mendelian inheritance method mitosis mutation natural selection normal nucleus number of chromosomes observed obtained offspring organisms origin of species ovum pairs of allelomorphs parent particular phenomena phenomenon pollen present produced purple R. C. Punnett race regarded represented resemblance result seeds separate similar single somatic spermatozoa stature structure supposed T. H. Morgan takes place theory tion variability variety Vries Weismann's whilst x-generation yellow zygote
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第 45 頁 - There is, in short, no bound to the prolific nature of plants or animals, but what is made by their crowding and interfering with each other's means of subsistence. Were the face of the earth vacant of other plants, it might be gradually sowed and overspread with one kind only, as, for instance, with fennel; and were it empty of other inhabitants, it might in a few ages be replenished from one nation only, as, for instance, with Englishmen.
第 282 頁 - the study of agencies under social control that may improve or impair the racial qualities of future generations, either physically or mentally.
第 29 頁 - ... the world itself might have been generated, rather than created; that is, it might have been gradually produced from very small beginnings, increasing by the activity of its inherent principles, rather than by a sudden evolution of the whole by the Almighty fiat.
第 71 頁 - Close contemplation of the facts impresses me more strongly than ever with the two alternatives — either there has been inheritance of acquired characters, or there has been no evolution.
第 323 頁 - I do not know whether you have any illusions left on the subject of education, progress, and so forth. I have none. Any pamphleteer can shew the way to better things ; but when there is no will there is no way. My nurse was fond of remarking that you cannot make a silk purse out of a sow's ear ; and the more I see of the efforts of our churches and universities and literary sages to raise the mass above...
第 48 頁 - But if variations useful to any organic being ever do occur, assuredly individuals thus characterised will have the best chance of being preserved in the struggle for life; and from the strong principle of inheritance, these will tend to produce offspring similarly characterised. This principle of preservation, or the survival of the fittest, I have called Natural Selection.
第 226 頁 - the mean character of the offspring can be calculated with the more exactness, the more extensive our knowledge of the corresponding characters of the ancestry...
第 48 頁 - This principle of preservation, or the survival of the fittest, I have called Natural Selection. It leads to the improvement of each creature in relation to its organic and inorganic conditions of life ; and consequently, in most cases, to what must be regarded as an advance in organisation. Nevertheless, low and simple forms will long endure if well fitted for their simple conditions of life.
第 122 頁 - Mr. Darwin's position might, we think, have been even stronger than it is if he had not embarrassed himself with the aphorism, " Natura non facit saltum," which turns up so often in his pages. We believe, as we have said above, that Nature does make jumps now and then, and a recognition of the fact is of no small importance in disposing of many minor objections to the doctrine of transmutation.