Science 9, Module 1: Cell Division

Science Elluminate Session Wednesday February 20th, 2008

Science 9 Agenda Deadlines and Reminders Review Question Time

Science 9 - Deadlines & Reminders This week: complete sections 1.3 and 1.4 Week of February 25th: write module test or hand in project Week of March 3rd: complete section 2.1 See the Grade 9 calendar for deadlines. OUR GOAL -- BE DONE BY JUNE 6th!!!

Science 9 -- Cell Review Cell Parts and Functions Plant Cells vs. Animal Cells Nucleus: procaryotic vs eukaryotic DNA, Genes, and Chromosomes

Science 9 - Making Proteins DNA --> mRNA --> protein DNA: made of nucleotides, double stranded, in nucleus mRNA: made of nucleotides, single stranded, in cytoplasm protein: made of amino acids, made by ribosomes in cytoplasm Use codon chart (pg 33) to determine what amino acid is coded by the mRNA. Bottom Line: DNA is the genetic code; it determines what we are, who we are and what we are made of.

Science 9 - Cell Division Cell Cycle: Cells spend most of their time growing. Before cells divide, all of the information in the DNA must be copied; this process is called mitosis. When the cell actually divides, this is called cytokinesis (cyto = cell)

Science 9 - Phases of the Cell Cycle Simple mnemonic: I Put My Alligator Through College I = Interphase -- the longest part of the cell cycle, cell growth and repair, organelles are duplicated P = Prophase -- 1st stage of mitosis nuclear envelope dissolves, chromosomes condense and become visible, centrioles start moving to the poles, spindle fibres become visible and attach to chromosomes M = Metaphase -- 2nd stage of mitosis X-shaped chromosomes line up along the centre of the cell A = Anaphase -- 3rd stage of mitosis chromosomes are pulled to opposite ends of the cell T = Telophase -- 4th stage of mitosis nuclear membrane forms around the two new nuclei, spindle disappear, chromosomes unwind and are no longer visible. C = Cytokinesis -- cell divides in half (animal cell pinches, plant cell, cell plate forms)

Science 9 -- Meiosis Mitosis is a form of asexual reproduction where there is a single parent producing 2 identical offspring (cells). Sexual Reproduction requires 2 parents and results in offspring that are not identical. Sexual Reproduction involves sperm and eggs (ova). What would happen to the number of chromosomes if sperm and eggs were produced by mitosis? Meiosis is the form of cell division used to produce eggs and sperm.

Science 9 - Question Time

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Science 9, Module 1: Cell Division

by Claire Thompson on Feb 21, 2008

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Science 9, Module 1: Cell Division — Webinar Transcript