File:Morgan 1925 fig33.jpg

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Fig. 33. Section of egg of Calligrapha bigsbyana

a, Section of egg of Calligrapha bigsbyana, showing "germ-cell determinants" (granules), g c d, at posterior end of egg; b, posterior end of a later stage of same, showing primordial germ-cells; c, Section of egg of Miastor, showing single primordial germ-cell at posterior end. (After Hegner.) 

Calligrapha Bigsbyana, a Chrysomelid Beetle.

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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


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

Cite this page: Hill, M.A. (2019, August 21) Embryology Morgan 1925 fig33.jpg. Retrieved from

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