The Genetic And the Operative Evidence Relating to Secondary Sexual Characters
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In our eReader you can find the full English version of the book. Read The Genetic And the Operative Evidence Relating to Secondary Sexual Characters Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Genetic And the Operative Evidence Relating to Secondary Sexual Characters
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To quickly assess the difficulty of the text, read a short excerpt:
Nussbaiun and Meisenheimer had found that transplantation of pieces of the testes, and even injection of testes extract, into castrated frogs caused an enlargement of the thumb-pads. Smith shows that this conclusion rests on uncritical evidence. At any rate, his own more carefully planned experiments extending over the year show that the results obtained by Nussbaum and by Meisenheimer may be accounted for on other grounds than the effect of the injection or implantation.
The following statemen...t by Smith is not without interest, since it bears directly on an important question as to how internal secretions may produce their effects.
"The deduction, therefore, which has been unduly based on Nussbaum's experiments, that the testis of the frog contains an internal secretion, which, on being circulated in the blood, calls for the development of the secondary sexual characters, either with or without the mediation of the nervous system, is without experimental f oimdation The fact that the developmental cycle of the thumb depends for its normal course on the presence of normal living testicular tissue can be equally well explained on the theory that the testicular cells enter into a chain of metaboUc processes in the body which do not pursue their normal course in the absence of the testicular cells.
What to read after The Genetic And the Operative Evidence Relating to Secondary Sexual Characters?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Hunt Morgan to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Nussbaiun and Meisenheimer had found that transplantation of pieces of the testes, and even injection of testes extract, into castrated frogs caused an enlargement of the thumb-pads. Smith shows that this conclusion rests on uncritical evidence. At any rate, his own more carefully planned experiments extending over the year show that the results obtained by Nussbaum and by Meisenheimer may be accounted for on other grounds than the effect of the injection or implantation.
The following statemen...t by Smith is not without interest, since it bears directly on an important question as to how internal secretions may produce their effects.
"The deduction, therefore, which has been unduly based on Nussbaum's experiments, that the testis of the frog contains an internal secretion, which, on being circulated in the blood, calls for the development of the secondary sexual characters, either with or without the mediation of the nervous system, is without experimental f oimdation The fact that the developmental cycle of the thumb depends for its normal course on the presence of normal living testicular tissue can be equally well explained on the theory that the testicular cells enter into a chain of metaboUc processes in the body which do not pursue their normal course in the absence of the testicular cells.
What to read after The Genetic And the Operative Evidence Relating to Secondary Sexual Characters?
You can find similar books in the "Read Also" column, or choose other free books by Thomas Hunt Morgan to read onlineMoreLess
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