Figure 18-6. Centriole replication.

Figure 18-6Centriole replication

The centrosome consists of a centriole pair and associated matrix (green). At a certain point in G1, the two centrioles of the pair separate by a few micrometers. During S phase, a daughter centriole begins to grow near the base of each mother centriole and at a right angle to it. The elongation of the daughter centriole is usually completed by G2. The two centriole pairs remain close together in a single centrosomal complex until the beginning of M phase (see Figure 18-7), when the complex splits in two and the two halves begin to separate. Each centrosome now nucleates its own radial array of microtubules called an aster.

From: An Overview of M Phase

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 .

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