Cell Division WarmUp

1
Cell DivisionWarm-Up

• Decide if these statements are true. If not
  true, correct them.
• Cell theory tells us that cells arise from
  chemical reactions.
• Cells passively receive energy and nutrients.
• In a multicellular organism, some cells
  specialize.

2
Cell DivisionWarm-Up

• Cell theory tells us that cells arise from
  chemical reactions. Cell theory tells us that
  cells arise from other cells.
• Cells passively receive energy and nutrients.
  Cells actively take in and release energy and
  nutrients.
• In a multicellular organism, some cells
  specialize. True.

3
Cell Division

• What are you and every other living thing made
  of?
• Where do cells come from?
• How does a cell know how to function and
  reproduce?

4
Cell Division

• The cell is the basic unit of structure and
  function of living things.
• All cells come from other cells.
• DNA provides the instructions a cell needs to
  function and reproduce

5
Why is cell division important?

• Growth Organisms grow by increasing the number
  of cells through cell division
• Development Cells specialize as an organism
  develops (skin cells, muscle cells)
• Reproduction
• Repair Injuries are repaired by means of cell
  division as cells age and die they are replaced

6
Mitosis and DNA
Notes
Sketch

• DNA is compacted into chromosomes
• Found in the nucleus
• Chromosomes consist of two chromatids held
  together by a centromere

centromere
chromatid
7
MitosisAKA Cell Cycle

• A cycle is any activity or set of events that
  regularly repeats.
• All living things live, grow, reproduce, and die
  in a process called a life cycle.
• The cell cycle is the normal sequence of
  development and division of a cell.
• The cell cycle consists of two main phases
  Interphase and mitosis/cytokinesis.
• All cells divide, but only eukaryotes undergo
  mitosis.

8
Steps of Mitosis
Notes
Sketch

• Interphase Cell grows to almost double its
  original size and duplicates its DNA the cell is
  getting ready to begin mitosis

9
Steps of Mitosis
Notes
Sketch

• Prophase Chromosomes become visible nuclear
  membrane begins to disappear

10
Steps of Mitosis
Notes
Sketch

• Metaphase
• Chromosomes line up in the middle

11
Steps of Mitosis
Notes
Sketch

• Anaphase
• Chromosomes separate resulting in two separate
  identical chromosomes separated chromosomes pull
  to opposite ends of the cell

12
Steps of Mitosis
Notes
Sketch

• Telophase
• New nuclear membrane forms around each group of
  chromosomes cell pinches in the middle

13
Steps of Mitosis
Notes
Sketch

• Cytokinesis
• Division of the cytoplasm
• Results in two identical cells

14
Steps Remembered

• Interphase Interesting
• Prophase People
• Metaphase Meet
• Anaphase At
• Telophase Three o
• Cytokinesis Clock

15
Questions

• Why is cell division important?
• How is genetic material organized in eukaryotic
  cells?
• How does the cell get ready for mitosis?
• What are the four phases of mitosis?
• In what phase does the cells nuclear membrane
  disappear?
• What happens to chromosomes during anaphase?
• What are the two main parts of the cell cycle?
• How is the genetic material in two daughter cells
  similar to the genetic material in a parent cell?
• Describe in order the steps that occur during
  mitosis.