Essays Upon Heredity and Kindred Biological Problems: Authorised TranslationWeismann, August
Science
Essays Upon Heredity and Kindred Biological Problems: Authorised Translation
Weismann, August
Evolution (Biology); Genetics; Reproduction
These experiments, although very interesting, do not enable us to
assert that a distinct morphological change is transmitted to the
offspring after having been artificially induced in the parents. The
injury caused by the division of a nerve is not transmitted, and the
part of the brain corresponding to that which was removed from the
parent is not absent from the offspring. The symptoms of a disease
are undoubtedly transmitted, but the cause of the disease in the
offspring is the real question which requires solution. The symptoms
of epilepsy are by no means invariably transmitted; they are in fact
absent from the great majority of cases, and the very small
proportion in which they do occur, exhibit the symptoms of other
diseases in addition to those of epilepsy. The offspring are either
quite healthy (thirteen out of thirty cases) or they suffer from
disturbances of the nervous system, such as the above-mentioned motor
and trophic paralysis,—symptoms which are not characteristic of
epilepsy: however in some of the latter epilepsy is also present.
If therefore we wish to express the matter correctly we must not state
that epilepsy is transmitted to the offspring, but we must express the
facts in the following manner:—animals which have been rendered
epileptic by artificial means, transmit to some of their offspring a
tendency to suffer from various nervous diseases, viz. from motor
paralysis, to a less degree from sensory, and to a high degree from
trophic paralysis; in rare cases, when the symptoms of paralysis are
very marked, epilepsy is also transmitted.
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