Reproduction and Chromosome Transmission

7 in animal and plant cells the mitotic spindle is

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: In animal and plant cells, the mitotic spindle is formed from two structures called centrosomes, located at opposite poles (spindle poles) of the cell. In animals, a pair of centrioles at right angles to one another is found within each centrosome. Centrioles are not found in many other eukaryotic organisms, including plants, and are not required for spindle formation. 3 The transmission of chromosomes during the division of eukaryotic cells requires a process known as mitosis. After interphase, mitosis proceeds through five phases: prophase, prometaphase, metaphase, anaphase, and telophase (Figure 3.8). During prophase (Figure 3.8b) the nuclear membrane dissociates and the chromosomes condense. Also during this time the mitotic spindle apparatus forms, originating at the centrosomes. These microtubules are produced from the rapid polymerization of tubulin proteins. There are three types of microtubules (Figure 3.7). Aster microtubules emanate outward from the centrosome toward the plasma membrane; they are important for positioning of the spindle apparatus within the cell and later in the process of cell division. Pol...
View Full Document

This note was uploaded on 05/19/2011 for the course BIO 325 taught by Professor Saxena during the Spring '08 term at University of Texas at Austin.

Ask a homework question - tutors are online