1. CH8 Cell Reproduction

2. Why Cells Reproduce Growth of the organism
Replace old or damaged cells
Maintain cell size
Reduce size of cell as it grows
Surface area – to – volume ratio

3. Chromosomes Made up of organized and packaged DNA
Deoxyribonucleic Acid
2m of DNA in one cell (almost 2000 miles of DNA)
genes are segments of DNA (code RNA & Proteins)

4. In Text Pg 151

5. Terms to know Chromatin Histone
DNA and proteins
Histone
Protein what DNA winds around
Chromatid (s) (Sister – identical pair)
Made up of one strand of DNA
Centromere
Holds chromatids together

6. A Comparison Prokaryotic Cells Eukaryotic Cells No true nucleus
Single Circular Loop of DNA
23 prs (humans) of Linear DNA molecules
Condense with twisting and winding
Condense with help of histones

7. Preparing for Cell Division
DNA must be copied, sorted, separated
Organelles, in eukaryotes, must be duplicated
Prokaryotes go through binary fission

8. Eukaryotic Cell Division
Cell Cycle
Repeating sequence of events that occur during the life cycle of a cell
Growth
DNA replication
Division of the nucleus and cytoplasm

9. Cell Cycle Interphase consist of the 1st three
G1 (Cell growth)
organelles made
S (Synthesis)
DNA duplicated
G2 (Growth and preparation)
Microtubules form
Mitosis (Nucleus Divides)
Cytokinesis (Cytoplasm Divides)

10. Interphase Time in this phase varies
Controlled by signals from proteins and environment
G1 and G2 check points
Determine if cell healthy for division
Checks for mistakes in DNA copies