Download Making New Cells: Mitosis - Social Circle City Schools

Making New Cells:
Mitosis
Body Cells
• Mitosis: process used to make new body
cells
• Body cells are cells found in the human body
• Ex: Heart, lungs, skin, muscle, etc.
• Human body has 46 chromosomes in each
body cell
Mitosis within the cell cycle
• Cell cycle:
▫ Interphase
▫ Mitosis
▫ Cytokinesis
• Phases of mitosis
•
•
•
•
Prophase
Metaphase
Anaphase
Telophase
Mitosis: Prophase
• Chromatin in the nucleus condenses to form the
chromosomes
• Two pair of centrioles move to opposite sides of
the nucleus
Centrioles
• Nuclear envelope breaks down
Chromatin to
chromosomes
Mitosis: Metaphase
• Chromosomes line up
across the center of the cell
Centrioles
Chromosomes
• Each chromosome attaches
to a spindle fiber at the
centromere
• Hint: remember
metaphase starts with an
“M” and so does “middle”
Spindle fiber
Centomere
Mitosis: Anaphase
New chromosomes
• Centomeres split
• Chromatids separate
• Each chromatid becomes a new
chromosome
Chromatids separate
• Chromosomes move to opposite ends
of cell
• Hint: anaphase starts with an “A” and
so does “apart”
Nuclear envelope
Mitosis: Telophase
• Chromosomes begin to
stretch out
• New nuclear envelope
forms around each
region of chromosomes
Stretching chromosomes
New cells
• Eventually two new
cells are formed
• Then cytokinesis
begins
Process of Mitosis