. The cell in development and inheritance. Cells. Pig. 37.— Heterotypical mitosis in spermatocytes of the salamander. [Flemming.] A. Prophase, chromosomes in the form of scattered rings, each of which represents two daughter-chromosomes joined end to end. B. The rings ranged about the equator of the spindle and dividing; the svveHings indicate the ends of the chromosomes. C. The same viewed from the spindle-pole. D. Diagram (Hermann) showing the central spindle, asters, and centrosomes, and the contractile mantle-fibres attached to the rings (one of the latter dividing). 2. Bivalent and Pliirw
. The cell in development and inheritance. Cells. Pig. 37.— Heterotypical mitosis in spermatocytes of the salamander. [Flemming.] A. Prophase, chromosomes in the form of scattered rings, each of which represents two daughter-chromosomes joined end to end. B. The rings ranged about the equator of the spindle and dividing; the svveHings indicate the ends of the chromosomes. C. The same viewed from the spindle-pole. D. Diagram (Hermann) showing the central spindle, asters, and centrosomes, and the contractile mantle-fibres attached to the rings (one of the latter dividing). 2. Bivalent and Pliirwalent CJiromosomes The last paragraph leads to the consideration of certain varia- tions in the number of the chromosomes. Boveri discovered that the species Ascaiis nicgalocepJiala comprises two varieties which differ in no visible respect save in the number of chromosomes, the germ-nuclei of one form (" variety bivalens " of Hertwig) having two chromosomes,. 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, Macmillan
Size: 1261px × 1980px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1911
