This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ... decided in a certain direction, must of necessity go through the procedure of formation of gametes--entailing the phenomena of reduction--before it can fulfil its assigned office. Looked at in this light the following words of Ruckert acquire a special significance: "It (the reduction of chromosomes) is initiated ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ... decided in a certain direction, must of necessity go through the procedure of formation of gametes--entailing the phenomena of reduction--before it can fulfil its assigned office. Looked at in this light the following words of Ruckert acquire a special significance: "It (the reduction of chromosomes) is initiated before the ripening, perhaps already in the 08-and spermatogonia, by the omission of a transverse division of the chromatincoil, as a result of which each two chromosomes remain linked together" (in: Ergebn. Anat. Entw., V. 3, 1894, p. 582). The above had been written before Meves' recent paper 2) was 1) In connection with this question section VIII of the present writing should, however, be considered. In this portion of the text the writer has acted largely upon the assumption, that everything in the development must be effected by cell-division. Without question the separation of two categories of unlike gametes must originally have been carried out by mitosis. But after such separation there is nothing to prevent the postponement of the revelation to later periods by the acquirement of the faculty of going through further mitoses. As will appear anon, it is concluded, that the reduction is the outward manifestation of the determination of sex. Granted the possibility of the separation along two lines some time prior to the reduction and manifestation of sex, of such a kind, that all the cells produced along either line will have a certain fixed sexual destination, such as would appear to obtain in the leech and Styelopsis, the determination of sex would consist of, or be divisible into, two periods, one of separation by celldivision, the other of manifestation by the reduction. My final conclusion, therefore, is, that determination o...
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Add this copy of The Determination of Sex in Animal Development to cart. $53.62, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
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