. The cell in development and inheritance. Cells. X' -'-'<^2-. Fig. 100. — First type of maturation in the parthenogenetic egg of Artemia. [Brauer.] A. The first polar spindle; the equatorial plate contains 84 tetrads. B. C. Formation of the first polar body; 84 dyads remain in the egg and these give rise to the egg-nucleus, shown in D. F. Appearance of the egg-centrosome and aster. E. G. Division of the aster and formation of the cleavage-figure; the equatorial plate consists of 84 apparently single but in reality bivalent chromosomes. conception is exactly realized, while the other is eas
. The cell in development and inheritance. Cells. X' -'-'<^2-. Fig. 100. — First type of maturation in the parthenogenetic egg of Artemia. [Brauer.] A. The first polar spindle; the equatorial plate contains 84 tetrads. B. C. Formation of the first polar body; 84 dyads remain in the egg and these give rise to the egg-nucleus, shown in D. F. Appearance of the egg-centrosome and aster. E. G. Division of the aster and formation of the cleavage-figure; the equatorial plate consists of 84 apparently single but in reality bivalent chromosomes. conception is exactly realized, while the other is easily brought into relation with it. {a) In both modes typical tetrads are formed in the germ-nucleus to the number of eighty-four. In the first and more frequent case (Fig. too) but one polar body is formed, which removes eighty-four dyads, leaving eighty-four in the o.^^. There may be an abortive attempt to form a second polar spindle, but no division results, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, Edmund B. (Edmund Beecher), 1856-1939. New York : The Macmillan company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcells, bookyear1896
