The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 205
... mated with white . Moreover experience has shown us that white is a recessive and will not show if there is a single determiner for black . The two in the middle are simplex and will therefore produce both white and black if mated ...
... mated with white . Moreover experience has shown us that white is a recessive and will not show if there is a single determiner for black . The two in the middle are simplex and will therefore produce both white and black if mated ...
الصفحة 209
... mated with a non - barred breed , approximately one - half of the off- spring are barred , the rest are not . Moreover the barred ones will be found to be males , the non - barred females without exception . In other words the males are ...
... mated with a non - barred breed , approximately one - half of the off- spring are barred , the rest are not . Moreover the barred ones will be found to be males , the non - barred females without exception . In other words the males are ...
الصفحة 213
... mated with the ordinary type . It is known today that many of the " mutants " do not revert but breed true and we know , further , that it is possible to combine different units from different plants and perhaps produce a plant superior ...
... mated with the ordinary type . It is known today that many of the " mutants " do not revert but breed true and we know , further , that it is possible to combine different units from different plants and perhaps produce a plant superior ...
الصفحة 220
... mated with a male albino guinea - pig . From numerous experiments with al- bino guinea - pigs it may be stated emphatically that normal albinos mated together , without exception , produce only albino young , and the presumption is ...
... mated with a male albino guinea - pig . From numerous experiments with al- bino guinea - pigs it may be stated emphatically that normal albinos mated together , without exception , produce only albino young , and the presumption is ...
الصفحة 222
... mated to normal females . This is the paternal test , and is the really crucial proof of the influence of alcohol on the germ cells , since the defec- tive offspring in this case must be due to the modified spermatozoa , or male germ ...
... mated to normal females . This is the paternal test , and is the really crucial proof of the influence of alcohol on the germ cells , since the defec- tive offspring in this case must be due to the modified spermatozoa , or male germ ...
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عبارات ومصطلحات مألوفة
Africa America appeared Australoid average bacteria basis become believe biological birds birth-rate black bass blood body born brain breeding carbon carbon dioxid cause cent century cephalic index changes characters child chromosomes civilization color considered crossing Darwin death death-rate discovered discoveries disease earth eggs environment Europe European evidence evolution exist eyes fact feeble-minded female forms germ cells given groups hair head HEMOPHILIA hence heredity human Huntington's chorea Ibid Inasmuch inches increase individuals inheritance insane insects Kallikak Family known large numbers less living long-headed male man's mated Mendelian ment mental Mongols natural selection nature Negrito Negro normal organisms ovum parents physical plants and animals possible produced race relatively seems skin social society soil species spermatozoon square mile temperature thought tion traits woman women yellow yellow fever
مقاطع مشهورة
الصفحة 155 - Some drill and bore The solid earth, and from the strata there Extract a register, by which we learn, That he who made it, and revealed its date To Moses, was mistaken in its age.
الصفحة 139 - I happened to read for amusement ' Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
الصفحة 58 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
الصفحة 139 - In October 1838, that is, fifteen months after I had begun my systematic enquiry, I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would...
الصفحة 54 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organized creatures.
الصفحة 186 - The two parents between them contribute on the average onehalf of each inherited faculty, each of them contributing onequarter of it. The four grandparents contribute between them one-quarter, or each of them one-sixteenth ; and so on, the sum of the series i + J + i + TV + , being equal to 1, as it should be.
الصفحة 126 - This fool wishes to reverse the entire science of astronomy; but sacred Scripture tells us that Joshua commanded the sun to stand still, and not the earth.
الصفحة 58 - I am tempted to give one more instance showing how plants and animals, remote in the scale of nature, are bound together by a web of complex relations.
الصفحة 159 - I can conceive in biology would be the discovery of the instability which leads to the continual division of the cell. When I look at a dividing cell I feel as an astronomer might do if he beheld the formation of a double star: that an original act of creation is taking place before me.
الصفحة 58 - I have also found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads protected from bees produced not one.