Download 3 Stages of the Cell Cycle Notes

3 Stages of the Cell Cycle
STAGE 1: Interphase- period before cell division
I.
Growth
a. cell grows to its full size
b. produces all the structures needed to carry out functions
II.
DNA Replication_
a. makes an exact copy of DNA in its nucleus
b. two identical sets of DNA in the nucleus
c. one set will go to each “daughter cell”
III.
Preparation for Division
a. cell produces structures needed for division
b. cell is ready to divide
STAGE 2: Mitosis (nuclear division)
I.
Prophase – chromatin condenses to form chromosomes – double
rod-like structures made of chromatin
II.
Metaphase – chromosomes line up across the center of the cell
III.
Anaphase – chromatids separate and move to opposite ends of the
cell
IV.
Telophase – new nuclear membrane forms
STAGE 3: Cytokinesis (cell divides)
I.
Cell membrane squeezes together in animal cells
II.
Cell plate forms in plant cells
III.
Cytoplasm pinches into 2 cells
IV.
Organelles divide between the 2 daughter cells
Length of the Cell Cycle
a. Varies with the type of cell – 2 to 22 hours
b. Mitosis – 1 hour, Interphase – 21 hours in a liver cell
c. Brain Cells never divide