Download 3.2 Mitosis

Section 3.2
“Cell division is part of the cell
cycle”
Do Now
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Label the following diagram
1- chromosome
2- chromatid
3- centromere
Objectives
• Describe the main events of the cell cycle
• Differentiate interphase from mitosis
• Construct a cell cycle model from paper
plates.
Cell Cycle
• “normal sequence of development and
division of a cell”
• Contains 2 parts for eukaryotes
– Interphase
– M-phase (Mitosis)
Interphase
• There is no division
in interphase, just
growth.
– G1: organelles
duplicate, cell
grows
– S: DNA replicates
(is copied)
– G3: cell grows,
prepares to divide
M-phase (Mitosis
• Mitosis= “nuclear division”
• PMAT+ C
– Prophase
– Metaphase
– Anaphase
– Telophase
– Cyokinesis
Plate Models
• You are now going to make a study
tool using paper plates.
• Follow along while I show you how to
fold the plate, use the directions as a
guide.
• Pass out plates
Mitosis
• Creates 2 genetically IDENTICAL
daughter cells.
Prophase
– DNA condenses to form chromosomes.
– The nucleus dissapears.
Metaphase
– Chromosomes line up in the middle of
the cell at the “equator”
Anaphase
– Chromatids split
– Pulled to opposite sides of the cell
Telophase
– 2 nuclei form
– Nuclear membrane forms around each
group of chromosomes.
– The chromosomes become chromatin
again.
Cytokinesis
– Division of the
cytoplasm.
– Occurs
differently in
plant and
animal cells.
– 2 new daughter
cells form.
Cytokinesis
• Animal Cells:
– Membrane pinches
together and forms a
cleavage furrow until
the cells separate.
Cytokinesis
• Plant Cells:
– Cell plate forms
which becomes the
cell wall and divides
the two cells.