Books > Science & Mathematics > Biology, life sciences > Life sciences: general issues
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The Chromosome Complement (Paperback)
Loot Price: R1,468
Discovery Miles 14 680
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The Chromosome Complement (Paperback)
Series: Kern- und Zellteilung, 6 / A
Expected to ship within 10 - 15 working days
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Donate to Against Period Poverty
Total price: R1,488
Discovery Miles: 14 880
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material can serve both autocatalytic and heterocatalytic
functions. Thus not only is it unique in itB capacity for
self-replication but its base sequence determines the specificity
of proteins. And enzyme proteins are immediately responsible for
the peripheral metabolism which enables the organism to impose its
own kind of order on the raw materials it absorbs. The course of
development is determined not only by the nature of the genetic
material but by its over-all amount and the relative frequency of
the different functional units. Differential rates of epigenetic
activity matter also. In theory, therefore, differential
development within or even between individuals could be determined
by the differential replication of the various genetic elements or
by their differential activity. And further variation could arise
by the differential transmission of these elements between cells.
Indeed it would appear that all these possibilities are exploited
by living systems. If like is to beget like, however, any genetic
change which occurs during development must be undone, or else
germinal units preserved from change must be set aside. As far as
is known, genetic changes, even those involving only quantity or
relative amounts, are reversible to only a very limited extent so
that a change once done cannot be undone. Consequently genetic
changes during the development of presumptive germ-lines are either
non existant or minor and confined to a small class of un
aggregated deter minants."
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