. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GENETICS AND DEVELOPMENT 347 I think that this diagram which follows immediately from the pre- ceding analysis, is rather instructive. It demonstrates a simple inter- pretation of dominance; furthermore, we have to assume that the three forementioned types of cell division are themselves determined directly or indirectly by the action of other genes, which in genetic language are usually called modifiers. Dominance then is the result of the interaction in time of the heterozygous main gene with a number of others, the modifi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GENETICS AND DEVELOPMENT 347 I think that this diagram which follows immediately from the pre- ceding analysis, is rather instructive. It demonstrates a simple inter- pretation of dominance; furthermore, we have to assume that the three forementioned types of cell division are themselves determined directly or indirectly by the action of other genes, which in genetic language are usually called modifiers. Dominance then is the result of the interaction in time of the heterozygous main gene with a number of others, the modifiers. Those among you who are acquainted with Fisher's so- called theory of the origin of dominance will realize at once that only such a system, as presented here, will allow that dominance is changed « 3 4 5676 9 10 11 J, X. I i "1 """" .* ~"™ ( i .»*"~ 7 8 9 10 : I I I L_ 567 8 9 j i i i i. FIG. 1 by selection of modifiers. Moreover, the diagram may be used as a model for all possible determinations of developmental processes into which the embryology of an individual might be dissolved. By chang- ing the meaning of the variables, introducing new ones, or other threshold conditions, similar models might be derived for all kinds of facts relating differentiation to genie action. Finally, the diagram may show that it is of no use to discuss the problem of the quantity of the gene without con- sidering the corresponding reaction velocities through which alone the assumption of different but typical gene-quantities becomes important; because without this connection we have only a sterile hypothesis. Let. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/0
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
