File:Morgan 1925 fig06.jpg

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Fig. 6. Male and female vinegar fly, Drosophila melanogaster

For example, there have appeared in our cultures of the vinegar fly, Drosophila melanogaster (fig. 6) over four hundred new types that breed true. Each has arisen independently and suddenly. Every part of the body has been affected by one or another of these mutations. Many different kinds of changes have taken place in the wings and several of these involve the size of the wings. If we arrange the latter arbitrarily in the order of their size there will be an almost complete series beginning with normal wings and ending with those of apterous flies. Several of these types are represented in figure 7. The order in which these mutations occurred bears no relation to their size ; each originated independently from the wild type.


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Pages where the terms "Historic Textbook" and "Historic Embryology" appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms and interpretations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

Morgan (1925) Evolution and Genetics: 1 Different Kinds of Evolution | 2 Four Great Historical Speculations | 3 Evidence for Organic Evolution | 4 Materials of Evolution | 5 Mendel's Two Laws of Heredity | 6 Chromosomes and Mendel’s Two Laws | 7 Linkage Groups and the Chromosomes | 8 Sex-Linked Inheritance | 9 Crossing-over | 10 Natural Selection and Evolution | 11 Origin of Species by Natural Selection | 12 Non-Inheritance of Acquired Characters | 13 Human Inheritance | Figures

Reference

Morgan, T. H. (1925). Evolution and genetics. Princeton: Princeton University Press.



Cite this page: Hill, M.A. (2019, April 19) Embryology Morgan 1925 fig06.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Morgan_1925_fig06.jpg

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current16:09, 16 October 2014Thumbnail for version as of 16:09, 16 October 20141,128 × 737 (103 KB)Z8600021 (talk | contribs)
16:09, 16 October 2014Thumbnail for version as of 16:09, 16 October 20141,182 × 886 (122 KB)Z8600021 (talk | contribs)==Fig. 6. Male and female vinegar fly, Drosophila melanogaster== {{Morgan1925_figures}} Category:Fly
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