Cell Cycle

Front 1

interphase

Back 1

____________is made up of three subphases: G1 , S, and G2.

-Gap 1 (G1): cell growth and normal functions

-DNA synthesis (S): copies DNA

-Gap 2 (G2): additional growth

-Mitosis (M): includes division of the cell cytoplasm (cytokinesis)

Front 2

mitosis

Back 2

The purpose of _______ mitosis is a cell division: making two cell out of one.

The DNA is replicated in interphase (during the S phase.) At the end of DNA replication, the cell contains 2 identical sets of DNA.

In _______, the chromosomes have to break apart so that each new onlyh has one set of chromosomes.

Front 3

prophase

Back 3

_________ is characterized by four events:

1. Chromatin condenses to become chromosomes.

2. The nuclear membrane (envelope) dissapears.

3. Centrioles have separated and moved to oposite sides of the cell.

4. Spindle fibers form a bridge between the end of the cell.

Front 4

metaphase

Back 4

1. Chromosomes line up across the center of the cell.

2. Each chromosomes attaches to a spindle fiber at its centromere

Front 5

anaphase

Back 5

1. Centromeres that join the sister chromatids split.

2. Sister chromatids separate becoming individual chromosomes.

3. Seperated chromatids move to oppositesides of the cell.

Front 6

telophase

Back 6

1.Chromosomes (each consisting of a single chromatid) begin to lose their rodlike appearance.They are becoming chromatin again.

2. A new nuclear envelope forms (nuclear) around the chromosomes at each side of the cell.

3. Spindle fibers break down and dissolve.

4. Cytokinesis begins.

Front 7

Cytokinesis

Back 7

1. __________ is the division of the cytoplasm into two individual cells.

2. The process of _________ differs somewhat in plant and animal cells.

3. In animal cells the cell membrane pinches the cell into two nearly daughter cells.

4. In plant cells a structure known as a cell plate forms midway between the 2 nucleus, which gradually develops into a separating membrane.