Download Mitosis PPT

THE CELL CYCLE:
MITOSIS
OVERVIEW:
• The cell theory states that all cells come from preexisting cells. (Virchow)
• New cells are made through cell division.
• The cell cycle is the sequence of growth and
division of a cell.
INTERPHASE
• Majority of cell’s life is spent in
Interphase.
• Cell grows in size.
• Genetic material (DNA) is replicated
(S Phase of Interphase) in preparation
for division.
INTERPHASE
G1 phase-cell grows and protein
production is high
G0 phase-optional…no cell division
S phase-DNA synthesis and replication
of genetic material
G2 phase-Centrioles replicate; cell
prepares for division
MITOSIS (M PHASE)
• After Interphase, cells enter
Mitosis.
• Mitosis is the process by which 2
new identical cells are formed
(each with its own complete set of
chromosomes).
1. PROPHASE
• First and longest phase of Mitosis.
• Long, stringy chromatin coils up into
visible chromosomes.
• Nuclear membrane disappears.
• Spindle fibers form attached to the
centrioles. (animal cells)
METAPHASE
• Chromosomes move to
equator (middle) of the cell
and line up.
ANAPHASE
• The centromeres are split and
the sister chromatids are pulled
apart to opposite sides of the
cell.
TELOPHASE
• Two new daughter cells are
formed. The cells separate
completely in a process called
cytokinesis which is the end of
mitosis.
SUMMARY
Mitosis