Abstract
O. and R. HERTWIGS’s early discovery of artificial parthenogenesis in sea urchins raised many questions: What is the origin of the centriole, asters and spindle? What cytological changes follow parthenogenetic activation? Do parthenogenetic embryos develop with the haploid or diploid set of chromosomes? R. HERTWIG (1896) found that after treatment with a strychnine solution the nucleus of Echinus and Sphaev echinus eggs may give rise to a typical mitotic spindle in which the chromosomes divide. MORGAN (1899, 1900) observed artificial astrospheres in the cytoplasm of Avbacia eggs treated with hypertonic solutions of NaCl or MgCl2 or with strychnine. The centrioles Were thought to arise de novo and possibly to develop from the achromatic part of the nucleus.
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© 1975 Springer-Verlag Berlin · Heidelberg
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von Ledebur-Villiger, M. (1975). Cytology of Parthenogenetically Activated Sea Urchin Eggs. In: Czihak, G. (eds) The Sea Urchin Embryo. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65964-5_8
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DOI: https://doi.org/10.1007/978-3-642-65964-5_8
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