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