1. Cell Division

2. How is DNA Packaged?
As you watch the video clip, define the following terms:
Histone
Nucleosome
Chromatin
Chromosome

3. Cell Division Vocabulary
Centriole
Centromere
Chromosome
Chromatid
Chromatin
Cytokinesis
Diploid
Gamete
Haploid
Meiosis
Mitosis
Somatic cells

4. Centriole Chromatid Chromatin Centromere Cytokinesis Chromosome
Cell organelle that helps separate chromosomes during mitosis
Centromere
the “center” of a chromosome
Chromosome
X-shaped structure made of condensed DNA
Chromatid
One half of a chromosome
Chromatin
DNA in a loose,
less condensed
form
Cytokinesis
Division of cytoplasm

5. Meiosis Diploid Gamete Mitosis Somatic cells Haploid
Divides a diploid (2n) cell into a haploid (n) cell
Necessary for sexual reproduction
Mitosis
Cell division
Somatic cells
Body cell (includes all but gametes)
Diploid
Cell having 2 copies of each chromosome
“2n”
Gamete
Sex cell
Egg or sperm
Haploid
Cell having only one copy of each chromosome
“n”

6. Cell Cycle
Cells go through a predictable pattern of growth/development and replication
Interphase
Gap 1- cell growth
Synthesis- DNA is replicated
Gap 2- cell growth
Mitosis
Prophase, Metaphase, Anaphase, Telophase, Cytokinesis

7. What Happens When Cells Can’t Stop Dividing?
Read this passage on cancer cells
Why is cancer cell division compared to “a car moving without having pressure applied to the gas pedal”?
What is the role of estrogen in a normal cell?
What is “contact inhibition”? Why is this important for normal cell growth?
Why do cancer cells often contain mutated DNA?