HeredityJ. Murray, 1908 - 605 من الصفحات |
طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
abnormal acquired characters affect albino ancestors animals appear biological body breed true breeders cells centrosome chromosomes colour constitutional crossed cytoplasm Darwin determinants disease distinction dominant embryo environment Epenthesis evidence evolution experiments expression fact father female fertilised Galton gametes germ germ-cells germ-plasm germinal variation Herbert Spencer hereditary heredity heritable hybrids hypothesis illustrate immune inborn inbred inbreeding individual infection influence inheritance interpretation Karl Pearson larvæ latent male material Mendel's Mendelian inheritance microbic modifications mother mutations natural selection normal nucleus number of chromosomes nurture nutrition occur offspring organism origin ovum pangenesis parents parthenogenetic particular peas peculiarities persistence physiological plants polar bodies possible predisposition prepotent produced Prof progeny pure race reappearance regard regression reproductive resemblance reversion seems sire species spermatozoon statistical structural suggested supposed T. H. Morgan telegony theory tion transmission transmitted unit characters variety Vries Weismann
مقاطع مشهورة
الصفحة 395 - Like leaves on trees the race of man is found, Now green in youth, now withering on the ground ; Another race the following spring supplies ; They fall successive, and successive rise : So generations in their course decay; So flourish these when those are pass'd away.
الصفحة 312 - It must be clearly understood that there is nothing in these statements to invalidate the general doctrine that the children of a gifted pair are much more likely to be gifted than the children of a mediocre pair. They merely express the fact that the ablest of all the children of a few gifted pairs is not likely to be as gifted as the ablest of all the children of a very great many mediocre pairs
الصفحة 312 - The more bountifully a parent is gifted by nature, the more rare will be his good fortune if he begets a son who is as richly endowed as himself, and still more so if he has a son who is endowed yet more largely.
الصفحة 415 - I have attempted to explain heredity by supposing that in each ontogeny, a part of the specific germ-plasm contained in the parent egg-cell is not used up in the construction of the body of the offspring, but is reserved unchanged for the formation of the germ-cells of the following generation.
الصفحة 117 - Is there evil but on earth? or pain in every peopled sphere? Well be grateful for the sounding watchword 'Evolution' here, Evolution ever climbing after some ideal good, And Reversion ever dragging Evolution in the mud.
الصفحة 3 - Since the issues of the individual life are in great part determined by what the living creature is or has to start with, in virtue of its hereditary relation...
الصفحة 311 - However paradoxical it may appear at first sight, it is theoretically a necessary fact, and one that is clearly confirmed by observation, that the stature of the adult offspring must on the whole be more mediocre than the stature of their parents — that is to say, more near to the median stature of the general population.
الصفحة 368 - It is hardly too much to say that the experiments which led to this advance in knowledge are worthy to rank with those that laid the foundation of the Atomic laws of Chemistry.
الصفحة 206 - ... jaws in chewing coarse, uncooked food, would act in a direct manner on the masticatory muscles, and on the bones to which they are attached. In infants, long before birth, the skin on the soles of the feet is thicker than on any other part of the body; and it can hardly be doubted that this is due to the inherited effects of pressure during a long series of generations.
الصفحة 126 - The father with a great excess of the character contributes sons with an excess, but a less excess of it ; the father with a great defect of the character contributes sons with a defect, but less defect of it. The general result is a sensible stability of type and variation from generation to generation.