Self Assessment Answer # 3 for Lesson 2 Dr Jamie Love 2002 - 2005

Centrosomes are the major organizers of chromosome movements. They help organize the microtubules into spindles. Centrosomes are very important in mitosis because they orient the chromosomes' migration.

Centrosomes are often, but not always, made of two centrioles. [Some species don't have centrioles.]

In G1 there is only one centrosome but this is duplicated during G2 so that by late G2 there are two centrosomes. A cell must have two centrosomes in order to complete mitosis and it is left with only a single centrosome after cytokinesis.

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