Centrioles and Centrosomes Chandler Kolb Honors Biology Green 2

Edouard Van Beneden & Theodor Boveri Edouard van Beneden discovered the centriole –experimented with chromosomes Theodor Boveri named the region centrosome (especial organ of cell division) - experimented with fertilization of a zygote

Structure Centrosome- “Microtubule Organizing Center” Centriole- small organelle that has three sets of nine fused microtubules Microtubules- tubular cytoplasmic filament composed of protein tubulin

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Function Cell division (Centrosomes) Mitosis- produces two daughter cells identical to the parent cell cilia and flagella (centrioles) the position if the centrioles determines the position of the nucleus a  crucial role in the spatial arrangement of cell organelles

Mitosis Four phases: Prophase, Metaphase, Anaphase, and Telophase Create a Spindle Apparatus 01%20Lectures/Mitosis/mitosis.htm 01%20Lectures/Mitosis/mitosis.htm..\..\Pictures\Cell Organelle Projects\Mitosis.exe

Animal or Plant Cell? Centrosomes are found in both Centrioles are only in animal cells Plants still perform Why? Cilia and flagella for cells are surface features used for cell movement, cells in plants aren’t required to move around like those in animal cells

Efficiency Centrosomes aren't necessary for cell division, however they greatly increase the efficiency Think about how many cells reproduce daily… An inability of cells to use centrioles to make functional cilia and flagella  a number of genetic and developmental diseases

Works Cited -7 November October s.htm s.htm November July Sept November 2009