File:Morgan 1925 fig31.jpg
Fig. 31. Diagram to show stages in fertilization of an egg by a spermatozoon
The three polar bodies lie at one pole, and the spermatozoon is represented as entering near the opposite side of the egg in 1 and 2. The head of the sperm swells up and moves towards the egg-nucleus, that has reformed after the polar bodies have been given off. A centrosome forms near the sperm-nucleus. It divides into two centrosomes, which begin to se])arate as a central spindle appears between them. Around each centrosome astral rays develop. The two nuclei come together in the middle of the egg to become the segmentation nucleus. A spindle develops around the nucleus.
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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 fig31.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Morgan_1925_fig31.jpg
- © Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G
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