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The Cell Cycle & Cell Division Q2 WK2 D1 science-class.net/PowerPoints/Cell%20Division.ppt

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What do we already know? Prokaryotic VS Eukaryotic cells Humans have Eukaryotic cells All cells have organelles (parts) Each organelle has a function (job)

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Cell Cycle & Cellular Division learning goal I can describe the purpose, phases and processes of cellular reproduction!

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The Cell Cycle http://www.nobel.se/medicine/laureates/2001/press.html Cell Cycle cut-out

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Cell Cycle G1- Growth phase. A cell grows quickly; largest part of the cycle. The beginning phase of cell divison. S- Synthesis phase; cells DNA is copied. Each chromosome consists of 2 chromatids attached at the centromere G2- Second Growth phase. Cell prepares for the nucleus to divide. A cell will spend nearly 90% of its life in stages G1 G2! M- Mitosis phase ; nucleus is divided into 2 nuceli. Each nucleus has same number of chromosomes. C- Cytokinesis The cytoplasm divides and 2 NEW CELLS ARE FORMED Cell Cycle cut-out

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S Phase: Chromosome Diagram http://www.biologycorner.com/bio1/celldivision-chromosomes.html

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Catching Some Killer Rays Explain why skin cancer might be more prevalent in California than in Arizona. In 2009, it was reported that new melanoma cases (dangerous form of skin cancer) was identified nearly 75% higher in men than women. Explain why some people can survive skin cancer, while others cant. http://www.epa.gov/sunwise/doc/az_facts_web.pdf Handout- Catching Some Killer Rays (Sci. Ntbk)

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Animated Cycle http://www.cellsalive.com/cell_cycle.htm

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Cancer Cells & The Cell Cycle Nearly everyone knows of someone who either has or had cancer. Why is it that some doctors are able to stop the cancer while others may not survive it? We will explore how cancer moves through the cell cycle.

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Plate Full of Knowledge: Cancer & the cell cycle http://science.education.nih.gov/supplements/nih1/cancer/activi ties/activity2_animations.htm http://science.education.nih.gov/supplements/nih1/cancer/activi ties/activity2_animations.htm Each person in your group is responsible for adding scoops (answers) to your plate, based on each video. You will place your scoop, on the proper section of your plate, creating a plate full of knowledge -Cancer & the Cell Cycle activity- gradebook

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Cancer & The Cell Cycle: Plate Full of Knowledge- Questions Video 1 Scoop1: Describe the rate of cells Scoop 2: Describe how cancer cells grow Video 2 Scoop 1: Describe the cell clock Video 3 Scoop 1: What are tumor suppressor genes? Scoop 2:Describe their importance Video 4 Scoop 1: What are mutations?

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Class discussion: Cancer and the Cell Cycle Video 1 Scoop1: Describe the rate of cells Scoop 2: Describe how cancer cells grow Video 2 Scoop 1: Describe the cell clock Video 3 Scoop 1: What are tumor suppressor genes? Scoop 2:Describe their importance Video 4 Scoop 1: What are mutations?

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Cancer Growth- Animation (Video) http://www.youtube.com/watch?v=WXTsxPPc TEs http://www.youtube.com/watch?v=WXTsxPPc TEs Stop & Think During the video, we will pause at specific phases of cancer development, you will be asked to explain what is happening in that phase

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Cancer & the Cell Cycle: Modeling Lets go outside

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Cancer Growth- Video Summary Video will be replayed In your notebook, write a summary of how cancer cells develop and why they are difficult to stop and what is needed to ensure tumors do not replicate

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Cancer- Active Reading

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MITOSIS Q2 WK2 D2

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When is mitosis used? Mitosis: reproduction of somatic (body) cells = cellular division Diploid: full # of chromosomes (2n) = 46 Haploid: half # of chromosomes (n) = 23 Somatic Cells (body cells) are Diploid Gametes (sex cells) are Haploid

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Stages of Mitosis Prophase Metaphase Anaphase Telophase

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Interphase: The cell prepares for division What happens? DNA replicates Organelles replicate Cell increases in size

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Interphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

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Prophase: The cell prepares for nuclear division What happens? DNA condenses into chromosomes, spindles form & nuclear envelope dissolves. The chromosomes become visible

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Prophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

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Metaphase: The cell prepares chromosomes for division What happens? Chromosomes line up at the center of the cell Spindle fibers attach from daughter cells to chromosomes at the centromere

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Metaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

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Anaphase: The chromosomes divide What happens? Spindle fibers pull chromosomes apart of each chromosome (called chromatid ) moves toward opposite pole

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Anaphase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

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Telophase: The cytoplasm divides What happens? DNA spreads out 2 nuclei form Spindles dissolve Cell membrane pinches in and forms the 2 new daughter cells

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Telophase Animal Cell Plant Cell Photographs from: http://www.bioweb.uncc.edu/biol1110/Stages.htm

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Cytokinesis: Final step in division What happens? Cytokinesis occurs when the cleavage furrow appears Division of the cytoplasm 2 identical daughter cells form

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Chromosome Review Chromosomes (x shaped) Chromatid (1/2 of an X) Centromere (holds chromatids together) Homologous Pair: 2 chromosomes together are known as TETRAD Asters: Small anchors that hold centrioles to side of cell