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Evolution by Gene Duplication (Paperback, Softcover reprint of the original 1st ed. 1970)
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Evolution by Gene Duplication (Paperback, Softcover reprint of the original 1st ed. 1970)
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It is said that "necessity is the mother of invention". To be sure,
wheels and pulleys were invented out of necessity by the tenacious
minds of upright citi zens. Looking at the history of mankind,
however, one has to add that "Ieisure is the mother of cultural
improvement". Man's creative genius flourished only when his mind,
freed from the worry of daily toils, was permitted to entertain
apparently useless thoughts. In the same manner, one might say with
regard to evolution that "natural selection mere(y tnodifted, while
redundanry created". Natural selection has been extremely effective
in policing alleHe mutations which arise in already existing gene
loci. Because of natural selection, organisms have been able to
adapt to changing environments, and by adaptive radiation many new
species were created from a common ancestral form. Y et, being an
effective policeman, natural selection is extremely conservative by
nature. Had evolution been entirely dependent upon natural
selection, from a bacterium only numerous forms of bacteria would
have emerged. The creation of metazoans, vertebrates and finally
mammals from unicellular organisms would have been quite impos
sible, for such big leaps in evolution required the creation of new
gene loci with previously nonexistent functions. Only the cistron
which became redun dant was able to escape from the relentless
pressure of natural selection, and by escaping, it accumulated
formerly forbidden mutations to emerge as a new gene locus.
General
Imprint: |
Springer-Verlag
|
Country of origin: |
Germany |
Release date: |
August 2014 |
First published: |
1970 |
Authors: |
Susumu Ohno
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Dimensions: |
254 x 178 x 10mm (L x W x T) |
Format: |
Paperback
|
Pages: |
160 |
Edition: |
Softcover reprint of the original 1st ed. 1970 |
ISBN-13: |
978-3-642-86661-6 |
Categories: |
Books >
Medicine >
General issues >
General
|
LSN: |
3-642-86661-1 |
Barcode: |
9783642866616 |
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