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Updated: June 7, 2025
True elementary species differ from each other in a number of unit-characters, which do not contrast. They have arisen by progressive mutation. One species has one kind of unit, another species has another kind. On combining these, there can be no interchange. Mendelism assumes such an interchange between units of the same character, but in a different condition.
We must shortly proceed to study the origin and determination of sex, and more especially of femaleness, in the individual, and here we shall be entirely concerned with the new knowledge commonly called Mendelism, to which there is no allusion in our authors' pages.
That method has been used, and used with success in every other kind of investigation, and we must investigate life too, even if it turns out to be all a kind of Mendelism, moved and swayed by absolutely fixed laws, which take no account of what we sorrowfully desire. Let us, then, gather up our threads a little.
Is there a quantitative addition of internal glandular tendencies in the germplasm, or a more complex rearrangement dependent upon reactions between all the internal secretions? The term endocrine dominants brings up the inquiries of Mendelism, and the relation of Mendelian conceptions of dominant and recessive to the internal secretions.
We may say, using the word 'determinant' as a convenient term for that which determines the adult characters, that in order to explain the origin of species or the origin of adaptations we must discover the origin of determinants. Mendelism does not throw any direct light on this question, but it certainly has shown how characters may be inherited as separate and independent units.
But to-day a number of maturer-looking volumes were adroitly mingled with the primeurs of the press Karl Marx jostled Professor Bergson, and the "Confessions of St. Augustine" lay beside the last work on "Mendelism"; so that even to Mrs. Leveret's fluttered perceptions it was clear that Mrs.
The American school recognizing in Mendelism a great advance and an important instrument for the discovery of new truth, has ignored the possibility that other undiscovered laws of heredity may exist and has cast aside as superfluous the valuable biometric tools wrought with much patient toil by Galton and Pearson.
The real problem, then, is the sex-limited heredity, and we shall consider later whether in this kind of heredity also there are characters of internal as well as external origin, blastogenic as well as somatogenic. Mendelism And The Heredity Of Sex
From this point Mendelism, as it is now called, has steadily gained ground, until at the present time it can be said to be the dominating conception among biologists the world over regarding the problems of heredity. Mendel worked chiefly with peas, crossing different varieties.
What meaning are we to attach to the words 'male ovum' or even 'male producing ovum'? It is a fundamental principle of Mendelism that the soma does not influence the gametocytes or gametes; we have therefore only to consider the sex of the gametes themselves, derived from a zygote which is formed by the union of two sexes.
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