The Cell Cycle. The Life of a Cell Cells pass through different stages in their lives These stages...
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Transcript of The Cell Cycle. The Life of a Cell Cells pass through different stages in their lives These stages...
The Cell Cycle
The Life of a Cell Cells pass through different stages in their
lives These stages = Cell Cycle Begins when cell forms, and ends when
cell divides Before division, has to copy its DNA
Prokaryotic or Eukaryotic? Prokaryotic cells:
simple! No membrane covered organelles, small circle of DNA.
Split into 2 parts = Binary fission
Each new cells contains 1 copy of the DNA
Eukaryotic cells More complex; more DNA DNA is in chromosome pairs =
homologous chromosomes Humans have 23 pairs, or 46 total
What do chromosome pairs look like?
The Cell Cycle
Phases of the Cell Cycle IPMAT Interphase: Cell grows (G1 and G2), and copies
its DNA (S = synthesis)
A Cell’s Life Interphase Mitosis
Prophase Metaphase Anaphase Telophase
Phases of Mitosis Prophase: PREPARATION phase; DNA twists
into chromosomes, nuclear membrane breaks down
Metaphase: Chromosomes MEET in the MIDDLE of the cell
Anaphase: Chromosomes separate and move APART
Telophase: The cell TEARS into two
Prophase Chromosomes starting to form, nuclear
membrane starts to break apart
Metaphase
Hint: Think of this as the meta or (middle) phase where chromosomes line up in the middle of the cell.
Anaphase
Hint: This is were the 2 sisters Ana and Ana are pulled apart to different ends of the cell…so sad.
Telophase
Hint: Now the sisters are far apart and starting separate lives. They have to call each other by TELOphone.
CytokinesisAt the end of Telophase the cell membrane pinches into two identical cells.
Animal Cell Plant Cell
In plant cells a cell plate forms and later becomes the cell membrane.
QUIZ1. The cell cycle is the cell’s what?
Life cycle2. What two main stages make up the cell cycle?
Interphase and Mitosis3. What happens during Interphase? During interphase the cell grows and copies its
DNA.
4. Mitosis is all about a cell doing what? Mitosis is all about cells dividing in half and
making sure each new cell has the exact same DNA as the parent cell.
QUIZ CONT.5. In what phase of Mitosis do the
chromosomes line up in the center of the cell?Metaphase
5. In what phase of Mitosis do the spindle fibers first pull the chromosomes apart?Anaphase
5. In what phase of the Mitosis do chromosomes start to form?
Prophase