mitosis
DESCRIPTION
Mitosis. How do living things grow and repair themselves?. Why do cells divide?. Reproduction Growth Repair. The cell cycle. Regular sequence of growth and division of cell 3 parts: Interphase Mitosis Division of cytoplasm. 1. Interphase. Longest part of cell cycle - PowerPoint PPT PresentationTRANSCRIPT
Mitosis
How do living things grow and repair themselves?
Why do cells divide?
Reproduction Growth Repair
The cell cycle
Regular sequence of growth and division of cell
3 parts:– Interphase– Mitosis– Division of cytoplasm
1. Interphase
Longest part of cell cycle
Cell grows to mature size
To prepare to divide, each chromosome makes a copy of itself
Length of interphase
Different kinds of cells spend different lengths of time in interphase
Human skin cells Human bone cells
2. Mitosis
Part where cell’s nucleus divides into two identical new nuclei
4 stages of mitosis (PMAT):– Prophase– Metaphase– Anaphase– Telophase
Prophase
Spindle forms Centrioles move to
opposite poles Chromosomes
become visible
Metaphase
Chromosomes line up along the equator
Anaphase
Chromosomes and duplicates separate and move to opposite poles
Telophase
Nuclear membrane forms around each group of chromosomes
Chromosomes unwind
Cytoplasm starts to divide
End result of mitosis
Two identical daughter cells Both cells have the same number of identical
chromosomes
3. Division of cytoplasm
Cytoplasm divides and one cell becomes two new cells with identical nuclei
Animal cells Plant cells