Intro to the cell cycle & mitosis 2011
Intro to the Cell Cycle & cell reproduction 1.Read pages Define the following terms: –Chromatin –Chromosomes –Sister chromatids –Centromere Draw a picture that represents each term 2.Read pages 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 (G 1 ) phase cell grows rapidly and carries out its routine functions. 2. Synthesis (S) phase A cell’s DNA is copied 3. Second growth (G 2 ) 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
Calculating total magnification: Eyepiece Objective lens X = Total Magnification
Intro to the Cell Cycle & cell reproduction 1.Read pages Define the following terms: –Chromatin –Chromosomes –Sister chromatids –Centromere Draw a picture that represents each term 2.Read pages Define the following terms: –Cell cycle –Interphase –Mitotic phase –cytokinesis