Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________
Cell Division
Asexual Reproduction: reproduction involving only _____ parent
Sexual Reproduction: reproduction requiring ______ parents
Chromosomes: molecules of DNA, ______ exist during cell
division; numbers vary depending on species ex: Potatoes, plums,
and chimpanzees all have 48 chromosomes in each cell. Humans
have ______.
The Cell Cycle:
Stages of the cell cycle
Mitosis: ___________ division plus cytokinesis, and produces ____
__________ daughter cells during prophase, metaphase, anaphase,
and telophase.
Steps of Mitosis
Step One: _______________
1. The chromatin, diffuse in interphase, condenses into
chromosomes.
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________
2. Each chromosome has duplicated and now consists of two
sister chromatids
3. At the end of prophase, the nuclear envelope breaks down into
vesicles.
Step Two: ______________
1. Chromosomes align in the middle of the cell
2. Chromosomes are held in place by spindle fibers
Step Three: _______________
1. The centromeres divide.
2. Sister chromatids separate and move toward the end of the cell
Step Four: _________________
1. Daughter chromosomes arrive at the poles and the
microtubules disappear.
2. The condensed chromatin expands and the nuclear envelope
reappears.
3. The cytoplasm divides, the cell membrane pinches inward
ultimately producing two daughter cells
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________
Results of Mitosis:
CYTOKINESIS “packages” the new, genetically identical nuclei
produced by mitosis into _________ ____________ cells.
______________ cell – cleavage furrow
______________ cell – cell plate
Dividing a Eukaryotic Cell
• Example: skin cell
Skin cell
A skin cell will divide to form
two skin cells. The genetic
information must be the
same.
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________
_________________: disease caused by severe disruption of the
mechanisms that normally control the cell cycle
_________ Tumor: mass of cells that remain at their original site
________________ Tumor: mass of abnormal cells resulting
from uncontrolled cancer cell division
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________
Meiosis
Sex Cells
Males: __ sperm
Females: ____ egg & ____ polar bodies
Meiosis: the production of ______ cells
Steps of Meiosis

First Division of Meiosis: Homologous Chromosomes
Separate
Step One: ________________
1. Each chromosome duplicates and remains closely associated.
2. These are called sister chromatids.
3. _______________ can occur during the latter part of this stage.
Step Two: __________________
1. Homologous chromosomes align at the equatorial plate.
Step Three: __________________
1. Homologous pairs separate with sister chromatids remaining
together.
Step Four: ___________________
1. Two daughter cells are formed with each daughter containing
only one chromosome of the homologous pair.
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________

Second Division of Meiosis: Gamete Formation
Step Five: ______________________
1. DNA does not replicate
Step Six: _______________________
1. Chromosomes align at the equatorial plate
Step Seven: ____________________
1. Centromeres divide and sister chromatids migrate separately to
each pole
Step Eight: _____________________
1. Cell division is complete.
2. Four haploid daughter cells are obtained.
Results of Meiosis:
One parent cell produces four daughter cells. Daughter cells have
___________ the number of chromosomes found in the original
parent cell and with crossing over, are genetically different.
Meiosis ______________ from mitosis primarily because there are
__________ cell divisions in meiosis, resulting in cells with a haploid
number of chromosomes.
Cell Division / Mitosis / Cancer / Meiosis – Notes
Name: ___________________________________________ Period: _______________