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Updated: May 8, 2025
Now if a result of this inter-dependence as seen in the individual organism, is that a local modification of one part produces, by changing their functions, correlative modifications of other parts, then the question here to be put is Are these correlative modifications, when of a kind falling within normal limits, inheritable or not. If they are inheritable, then the fact stated by Mr.
Little positive advice can yet be given as to those who are BEST fitted to have children, except in the matter of health and freedom from inheritable defects. But to breed the human stock for beauty, energy, mental ability, immunity to disease, sanity, or what not, is a task far beyond our present knowledge.
And lastly, he described the nature of the possessions which had been amassed by the late Earl, who, black with covetousness as he was with every other sin, had so manipulated his property that almost the whole of it had become personal, and was thus inheritable by a female heiress.
On the front of the house of Auchinleck is this inscription: ... Quod petis, hic est; Est Ulubris, animus si te non deficit aequus. It is characteristick of the founder; but the animus aequus is, alas! not inheritable, nor the subject of devise.
But, on the ground of the most fundamental of all things in the constitution of plants and animals the fact incapable of further analysis, that individuals reproduce their like, that characteristics are inheritable the likeness is a direct natural consequence of the genetic succession; "and it is logical to place the cause above the effect."
The whole organisation seems to have become plastic, and tends to depart in some small degree from that of the parental type. Any variation which is not inherited is unimportant for us. But the number and diversity of inheritable deviations of structure, both those of slight and those of considerable physiological importance, is endless. Dr.
It is equally true, as we shall see in the next chapter, that the nucleus of the ovum and the nucleus alone transmits maternal qualities. The material which conveys inheritable characters can be seen and has been identified in both germinal cells; from each of them the fertilized ovum derives equal amounts.
If the effects of use and disuse of parts are inheritable, then any change in the fore parts of the giraffe which affects the action of the hind limbs and back, will simultaneously cause, by the greater or less exercise of it, a re-moulding of each component in the hind limbs and back in a way adapted to the new demands; and generation after generation the entire structure of the hind-quarters will be progressively fitted to the changed structure of the fore-quarters: all the appliances for nutrition and innervation being at the same time progressively fitted to both.
Such cases may seem to prove that mutilation associated with morbid action is occasionally inherited or repeated with a promptitude and thoroughness that contrast most strikingly with the imperceptible nature of the immediate inheritance of the effects of use and disuse; but they by no means prove that mutilation in general is inheritable, and they are absolutely no proof whatever of a normal and non-pathological tendency to the inheritance of acquired characters.
Every one must have heard of cases of albinism, prickly skin, hairy bodies, etc., appearing in several members of the same family. If strange and rare deviations of structure are truly inherited, less strange and commoner deviations may be freely admitted to be inheritable.
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