Reproduction and Chromosome Transmission

The chromosomes now begin to migrate to their

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Unformatted text preview: chromosomes now begin to migrate to their respective poles of the cell. When the chromosomes reach opposite sides of the cell, they begin to decondense. This marks the start of telophase (Figure 3.8f). The nuclear membrane then reforms around the chromosomes. Question: Are kinetochore microtubules getting shorter at the centrosome or at the kinetochore? Are the chromosomes being “pulled” t oward the poles, or are they “pulling themselves” toward the poles? A K K P K K A 4 Microtubules shorten at the kinetochore, chromosomes pull themselves toward the poles Following telophase, the cell proceeds into cytokinesis, or cytoplasmic division (Figure 3.8f). In animal cells this involves the formation of a cleavage furrow (Figure 3.9a). In plant cells this involves the formation of a cell plate constructed from material carried by Golgi-derived vesicles (Figure 3.9b). The end result of mitosis and cytokinesis is two daughter cells that are genetically identical. Small variations are possible due to mutation in DNA sequence during replicat...
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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.

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