Summary
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1.
It is likely that internal factors play an important role in restricting the possible avenues of evolutionary change from any starting point. Internal selective processes operating on premutational disturbances, on mutations, and on developmental phases may usefully be separated from the adaptive selection of phenotypes.
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2.
The precise structural and morphological consequences of internal factors should soon become an isolable problem owing to a) the observational correlation of definite changes in hereditary specificity with particular developmental consequences; and b) the progressive theoretical identification of the coordinative conditions in organisms.
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3.
Increasing clarity regarding the coordinative conditions should throw light on the “mutational selection rules” and on the differentiative mutations which led to the most important steps in the past history of evolution.
Zusammenfassung
Die Wege der Evolution können sowohl durch innere Auslese der Genotypen wÄhrend der Entwicklung als auch durch die Äussere Darwinische Auslese der Phenotypen bestimmt werden. Seit 1949 haben sich zumindest fünf Forscher (Spurway, von Bertalanffy, Lima-de-Faria, Haldane und der Verfasser) mit dieser Möglichkeit befasst. Es ist zur Zeit möglich, zwischen den beiden Arten von Zuchtwahl theoretisch und experimentell zu unterscheiden.
Résumé
Les chemins de l'évolution peuvent Être déterminés non seulement par la sélection extérieure Darwinienne des phénotypes mais aussi par la sélection intérieure des genotypes pendant le développement. Depuis 1949 aux moins cinq investigateurs (Spurway, von Bertalanffy, Lima-de-Faria, Haldane, et l'auteur) en ont considéré la possibilité. Il est possible à présent de faire la distinction entre les deux types de sélection dans la théorie comme dans l'expérience.
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Whyte, L.L. Internal factors in evolution. Acta Biotheor 17, 33–48 (1964). https://doi.org/10.1007/BF01602054
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DOI: https://doi.org/10.1007/BF01602054