Post on 31-Dec-2015
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CELL CYCLE• Over time, many of the cells die and need to be
replaced. • Mitosis is the process by which a cell reproduces
to create two identical copies. • Cells formed by mitosis are known as daughter
cells. • The cell division process occurs as four different
stages, known collectively as the 'cell cycle'. • Many of the abnormal traits of cancer cells are
due to defects in genes that control cell division.
Happy Thursday! 11/14/13
FIRST TAKE out your CELL CYCLE notes and PRACTICE MITOSIS Sheet (aka Homework!)
BELLWORK QUESTIONS:1) What are the steps of mitosis in order?2) What phase matches this picture?
You have 3 minutes.
Cell Cycle• The cell cycle consists of four stages G0,
Interphase, M-phase, Cytokinesis• G1 and G2 are 'gap' phases in which the cell
grows and prepares to divide. • S in the synthesis phase in which the
chromatin (DNA) is copied (replicated). • M is the mitotic phase in which the cell
physically divides into two daughter cells. • Most cells are NOT actively dividing. These
cells are in a resting state (G).
• Mitosis is a process where cells are produced for growth and/or replacing damaged or old cells
• Mitosis in normal cells produces two cells with identical genetic content.
• Mitosis has four sub-phases:
TELOPHASE
• Nuclear envelopes re-form at the two poles and new cell membranes begin to form to create two independent cells
CYTOKINESISthe division of the cytoplasm to make two complete daughter cells
• ANIMAL CELLS– Cell membrane pinches apart
into two equal parts with one nucleus in each daughter cell
• PLANT CELLS– Cell plate forms between two
nuclei– Cell plate develops into a cell
wall
Animations
http://www.johnkyrk.com/mitosis.html
http://www.hybridmedicalanimation.com/anim_mitosis.html
Quiz
• http://www.biologycorner.com/flash/mitosis.html