Intro to the cell cycle & mitosis

2011

Intro to the Cell Cycle & cell reproduction

1. Read pages 180-182• Define the following

terms:– Chromatin– Chromosomes– Sister chromatids– Centromere

• Draw a picture that represents each term

2. Read pages 183-184• Define the following

terms:– Cell cycle– Interphase– Mitotic phase– cytokinesis

Goals for the Day

• Be able to define what the cell cycle is

• Be able to define what mitosis is, and what

its purpose is

• Be able to describe the phases of mitosis

(nuclear division)

Question of the Day

• What is a chromosome? Draw one.

Chromatin

Cell Cycle

• Purpose of the cell cycle

to reproduce, repair, & replace cells.

Cell Division

• Before Eukaryotic Cells divide they need to first replicate their control center, so that each new cell has one.

• In Eukaryotic cells that control center is known as the ____________.

• I say Eu, you say_______• I say Pro, you say _______

Cell Division

• Before the control center divides it must replicate its most important feature, the _______ which is housed in the nucleus of eukaryotes.

Cell Cycle

• Interphase – where a cell spends the majority of its life (over 90%)

5 Phases of the cell cycle

1. First growth (G1) phase cell grows rapidly and carries out its routine functions.

2. Synthesis (S) phase A cell’s DNA is copied

3. Second growth (G2) phase prepares for the nucleus to divide.

4. Mitosis the nucleus of a cell is divided into two

5. Cytokinesis the cytoplasm divides

Cell Cycle

• Mitosis – can be divided into 5 basic parts

• Prophase

• Metaphase

• Anaphase

• Telophase– Cytokinesis

Mitosis – Cell Division (Cell Reproduction)

Mitosis Phases

Interphase – This is where a cell spends a majority of its life.

Nucleus Cell

Membrane

Mitosis Movie

Chromatin

Prophase –

Centrioles and Spindle Fibers start to appear

Chromatids become visible

Nucleus disappears

Metaphase –

Chromosomes line up in the middle of the cell

(“meta” means middle)

Centrioles

Spindle Fibers

Chromosomes

Anaphase –

Spindle fibers separate the chromatids and pull them to opposite ends of the cell.

Centriole

Spindle Fibers

Chromatids

Telophase –

Cell membrane starts to pinch in the middle

Two new nuclei start to form in each new cell

Chromosomes disappear into the nucleus

Cytokinesis – the dividing up of the cytoplasm

Chromosomes Nuclei

Cell Membrane

Newt Lung Cell Mitosis

Cell Cycle

• The purpose of cell division is to reproduce, repair, & replace cells.

• There are certain genes and proteins that regulate a cells growth and reproduction.

Cell Cycle

• The purpose of cell division is to reproduce cells.

• Sometimes cells are not controlled by these genes & proteins

•Uncontrolled growth of cells is called cancer

Remember IPMAT

Cell Cycle

• Chromatid vs. chromosome

• Go through IPMAT, In what cycles do we have chromatids, in what cycles do we have chromosomes?

• (Hint: some phases will have both or niether)

Remember IPMAT

Goals for the Day

• Be able to define what the cell cycle is

• Be able to define what mitosis is, and what

its purposes are

• Be able to draw & describe the phases of

mitosis (nuclear division)

Question of the Day

• In what phase of the cell life cycle does a cell spend most of its time?

• What 3 major things will it do during this phase?

Cell Cycle

• The purpose of cell division is to reproduce, repair, & replace cells.

• There are certain genes and proteins that regulate a cells growth and reproduction.

• Uncontrolled growth would be________

Remember IPMAT

Cell Cycle

• Chromatid vs. chromosome

• Go through IPMAT, In what cycles do we have chromatids, in what cycles do we have chromosomes?

• (Hint: some phases will have both or niether)

Cell Cycle

• Chromatid vs. chromosome

• Go through IPMAT, In what cycles do we have chromatids, in what cycles do we have chromosomes?

• (Hint: some phases will have both or niether)

Cell Cycle Lab - IPMAT

Cell Cycle Lab - IPMAT

• Calculating total magnification:

Eyepiece Objective lens

X =Total

Magnification

Intro to the Cell Cycle & cell reproduction

1. Read pages 180-182• Define the following

terms:– Chromatin– Chromosomes– Sister chromatids– Centromere

• Draw a picture that represents each term

2. Read pages 183-184• Define the following

terms:– Cell cycle– Interphase– Mitotic phase– cytokinesis