Saturday, 28 April 2012

Research: Cell Cycle Control System and Mitosis


Let's start with the visuals!!!




Type of Cells - Eukaryotic cells are present within the cell cycle
Mitosis

Now for the scientific breakdown ... 
Most eukaryotic cells follow a process of growth and division called the cell cycle. The cell cycle has 5 key stages, this is called the interphase:



G1 – Cell grows

R – Cell decides whether to continue

S – Synthesis and replication of DNA occurs

G2 – Cell prepares to divide

M – Mitosis (cell divide)
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G1 - Normal cell functions occur, as well as cell growth

R - This is where cells are checked (as if a health check-up) to see if they're correct for cell and DNA replication

S - In this phase DNA replication occurs, making two copies of chromosome

G2 - Preparation for mitosis and cell division
M - Mitosis has 4 stages (1) Prophase (2) Metaphase (3) Anaphase (4) Telophase

(1) Prophase - Chromosomes become more visible, shorter and thicker. The nuclear envelope breaks down and spindle fibres form, moving to opposite sides of the cell
(2) Metaphase - Chromosomes line up along the equator/centre of the cell preparing to divide
(3) Anaphase - Chromosomes are divided by sister chromatids and move away via its spindle fibre
(4) Telophase - Chromosomes reach the opposite side of the cell and develop a new nuclear envelope around the chromosomes - they then uncoil

Cell Division - Cytokinesis (where cytoplasm separates) occurs and the cells divide into two genetically identical cells  

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Bibliography (Accessed on:24/4/12)

http://captain-nitrogen.tumblr.com/post/10949269310/life-working-against-itself

http://en.wikipedia.org/wiki/Cell_cycle
http://myuca.ucreative.ac.uk/webapps/blackboard/content/contentWrapper.jsp?attachment=true&navItem=content&content_id=_213801_1&displayName=Unit+6+Commission+2011%2F12+-+Dr+Klappa%27s+Scenarios&course_id=_18401_1&href=/%40%40/C84F84007104B6EF63C3CD312E74B6D5/courses/1/RCGA1008_11/content/_213801_1/Cancer%2520-%2520UCA.pdf

http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_cell_cycle_works.html

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