. The physical basis of heredity . Heredity. 40 PHYSICAL BASIS OF HEEEDITY half of each goes to one pole, and half to the other pole of the spindle (Fig. 15, b). One end of the spindle pro- trudes from the egg, and around it the protoplasm con- Fia. 14—06cyte of Ancyracanthus, a; growth period, 6; nucleus with tetrads, c. Mulsow.) (After stricts off (Fig. 15, c) to form the first polar body. About the six ovoidal chromosomes left in the egg a new spindle develops; and these chromosomes become drawn into its equator, where they divide again, half of each going. P'iG. 15.—Egg of Ancyracanthus wi
. The physical basis of heredity . Heredity. 40 PHYSICAL BASIS OF HEEEDITY half of each goes to one pole, and half to the other pole of the spindle (Fig. 15, b). One end of the spindle pro- trudes from the egg, and around it the protoplasm con- Fia. 14—06cyte of Ancyracanthus, a; growth period, 6; nucleus with tetrads, c. Mulsow.) (After stricts off (Fig. 15, c) to form the first polar body. About the six ovoidal chromosomes left in the egg a new spindle develops; and these chromosomes become drawn into its equator, where they divide again, half of each going. P'iG. 15.—Egg of Ancyracanthus with six tetrads, a; egg with first polar spindle, 6," egg after extrusion of first polar body, c; egg with second polar spindle, d; egg after the extrusion of both polar bodies, e. to one pole and half to the other (Fig. 15, d). A sec- ond protrusion takes place from the surface of the egg which pinches off to form the second polar body (Fig. 15, e). Thus, after two mitotic divisions, the egg has lost three-quarters of its chromatin, but retains half the full. 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 Morgan, Thomas Hunt, 1866-1945. Philadelphia : Lippincott
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