Figure 18-23. Bipolar spindle assembly without centrosomes in parthenogenetic embryos of the insect Sciara.

Figure 18-23Bipolar spindle assembly without centrosomes in parthenogenetic embryos of the insect Sciara.

The microtubules are stained green, the chromosomes red. The top fluorescence micrograph shows a normal spindle formed with centrosomes in a normally fertilized Sciara embryo. The bottom micrograph shows a spindle formed without centrosomes in an embryo that initiated development without fertilization. Note that the spindle with centrosomes has an aster at each pole of the spindle, whereas the spindle formed without centrosomes does not. Both types of spindles are able to segregate the replicated chromosomes. (From B. de Saint Phalle and W. Sullivan, J. Cell Biol. 141:1383–1391, 1998. © The Rockefeller University Press.)

From: Mitosis

Cover of Molecular Biology of the Cell
Molecular Biology of the Cell. 4th edition.
Alberts B, Johnson A, Lewis J, et al.
New York: Garland Science; 2002.
Copyright © 2002, Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, and Peter Walter; Copyright © 1983, 1989, 1994, Bruce Alberts, Dennis Bray, Julian Lewis, Martin Raff, Keith Roberts, and James D. Watson .

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.