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Some Mendelians maintain that if the mutations are not compatible with the existing conditions of life, the organism must either die or find new conditions in which it can live.
When we compare the results reached by the mutationists with those obtained by the Mendelians we find that they tend to two different conceptions of the relation between the gametes and the organism developed from them. The effect of a change in the determinants of the gametes according to the mutationists is evident in every part of the plant.
The Mendelians used to say it was impossible to believe in the heredity of somatic modifications due to external conditions, because it was impossible to conceive of any means by which such modifications could affect the constitution of the chromosomes in the gametes within the modified body.
Mutationists and Mendelians do not seem in the least to appreciate the importance of metamorphosis or of development generally in considering the relation of the mutations or factors which they study to evolution in general, because they have not grasped the fact that there are two kinds of characters to be explained, adaptational and non-adaptational.
Moreover, a vigorous fire of mutual criticism was going on now between the Imperial College and the Cambridge Mendelians and echoed in the lectures. From beginning to end it was first-hand stuff.
He states that although some Mendelians have spoken of genetic factors as permanent and indestructible, he is satisfied that they may occasionally undergo a quantitative disintegration, the results of which he calls subtraction or reduction stages.
The Mendelians have given much attention to facts of this nature; and though their general method of exposition seems to me quite unjustifiably exact and precise, it cannot be denied that it is often vividly illuminating. It is so in this connexion.
He loves the Mendelians because he hates all the big names of the eighties and nineties. Then I think I remarked that science was disgracefully under-endowed, and confessed I'd had to take to more profitable courses. 'The fact of it is, I said, 'I'm the new playwright, Thomas More. Perhaps you've heard ? Well, you know, he had." "Fame!" "Isn't it? 'I've not seen your play, Mr.
As modern chemistry can analyse a highly complex molecule into its constituent elementary atoms, so the Mendelians promise ere long to enable us to effect an organic analysis of living creatures.
Such, at least, is the well-grounded opinion of all who have acquainted themselves with the work of the Mendelians, as we shall see: and therefore that book is by no means commended to the reader's attention as the last word upon the subject. The rather would one particularly direct him to the following prophetic and admirable passage in the preface of 1900:
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