On Germinal Selection as a Source of Definite Variation — John Shaqi
On Germinal Selection as a Source of Definite VariationWeismann, August
Science
On Germinal Selection as a Source of Definite Variation
Weismann, August
Variation (Biology)
Still the two are not solely a result of observation, deduced from
paleontological data; they are also _a consequence of the theory of
selection_, as was shown in the text. If the theory in its previous form
was unable to fulfil this requirement, it is certainly now able to do so
after germinal selection has been added, and it is not in any sense
necessary to assume a difference of _character_ between phylogenetic and
ontogenetic variations. Bateson and Scott are wrong in imagining that I ask
them "to abrogate reason" in pronouncing the "omnipotence of natural
selection." On the contrary, the theory seems to me to accord so perfectly
with the facts that we might, by reversing the process, actually construct
the facts from the theory. What other than the actual conditions could be
expected, if it is a fact that selection favors only the useful variations
and singles them out from the rest by producing them in {74} increasing
distinctness and volume with every generation, and also in an increasing
number of individuals? The mere displacement of the zero-point of useful
variations alone must produce this effect, especially when it is supported
by germinal selection. It is impossible, indeed, to see how considerable,
that is perceptible, deviations could arise at all on the path of phyletic
development if in each generation a large number of individuals always
possessed the useful, that is, the phyletic variations? In fact, by the
assumption itself, the difference between useful and less useful variations
is merely one of degree, and that a slight one.
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