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extend from the poles to the kinetochores
attach to kinetochore What is the FUNCTION of the KINETOCHORE MICROTUBULES? NONKINETOCHORE Microtubules
- radiate from each centrosome towards the metaphase plate without attaching to chromosomes
- may overlap with those from the opposite pole What are the FUNCTIONS the NONKINETOCHORE MICROTUBULES? lengthen assist in elongating entire cell
Form a cage like network which facilitates activites of cell cycle
METAPHASE (THE ORGANIZING PHASE) line up
- chromosomes line up along the metaphase plate
- centromeres are aligned on the metaphase plate, which is located equidistant from the two poles
ANAPHASE (SEPARATING DNA COPIES)
- binding proteins between the sister chromatids break down
- centromeres of sister chromatids disjoin and segregate, this process is called Disjunctional Segregation
- chromosomes move centromere first (they appear "V-shaped” ) - towards the end of anaphase, the two poles have identical numbers of chromosomes
- the cell elongates
TELOPHASE forms 2 daughter cells - nonkinetochore microtubules further elongate the cell
- two daughter nuclei form
- formation of the nuclear envelopes around each set of chromosomes 5
CYTOKINESIS (CYTOPLASM DIVISION)
- telophase is often , but not always, followed by cytokinesis
Fig.11.9 The Mechanism of...
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This note was uploaded on 10/14/2012 for the course ASTRO 1f03 taught by Professor Perkins during the Spring '12 term at McMaster University.
- Spring '12