Biology 1 Cell Cycle-Mitosis
Terms in this set (12)
Why do cells divide?
- The cell becomes too large for the DNA to keep control.
- The cell membrane cannot exchange enough materials and waste (if the cell is too big).
cells divide and grow at an uncontrolled rate.
Four Phases of the Cell Cycle
G1 Phase - cell growth
S Phase - DNA replication
G2 Phase - preparation for mitosis
M Phase - Mitosis
G1, S and G2 Phases
"in between" period of growth
- cell is in resting phase
- DNA replicates (copies)
- organelles double in number
- LONGEST part of the cell cycle
cell divides into two identical daughter cells
Four Phases of Mitosis
- spindle forms
- centriole/centrosomes move to opposite poles
- chromosomes become visible
- DNA coils around histones
chromosomes line up along the equator or the cell (meet in the middle in metaphase!)
- centromeres divide
- chromatids separate and move to opposite poles
- nuclear membrane forms around each group of chromosomes
- chromosomes unwind into chromatin
- cytokinesis begins
cytoplasm divides and one cell becomes two individual cells
Animals - cell pinches inward
Plants - a new cell wall forms between the two new cells
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