File:Morgan 1925 fig35.jpg

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Fig. 35. Diagram illustrating the two maturation divisions of the egg

In a the polar spindle is present at the periphery of the egg. The three pairs of chromosomes (bivalents) are represented in black and white; the white being the paternal and the black the maternal. In b the conjugating chromosomes have separated and are moving to the poles. In c the first polar body has been given off, leaving three single chromosomes in the egg. In c these have split lengthwise and lie off the equator of a new spindle. In e the daughter chromosomes have separated and moved to opposite poles. In / the second polar body has been given off and the first polar body has divided. Three single chromosomes are left in the egg.

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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, February 22) Embryology Morgan 1925 fig35.jpg. Retrieved from

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