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9 0 / 6 2 / Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. 99/26/09 1:10:32 AM From a Cell to an Organism an to Cell a From stage. 1 stage—is a period of growth and final final stage—is a period of growth and 2 2 6
2 6 i . 4 5 4 1 9 8 _ t u Two new daughter cells result from mitosis and cytokinesis. Two During prophase, duplicated DNA condenses into chromosomes. of the cell. During metaphase, the chromosomes line up in the middle Before a cell divides, it makes copies of all its organelles. In mitosis, the nucleus and its contents divide. In cytokinesis, the cytoplasm and its contents divide. chromosome. together by a structure called the centromere. The sister chromatids are held G The final stage of interphase—the Interphase begins with a period of rapid growth—the G Interphase begins with a period the cell replicates its strands of chromatin. During the S stage of interphase, identical strands of DNA that make up the duplicated Sister chromatids are the two Interphase makes up most of the cell cycle. Interphase makes up most of the the cell is called chromatin. During interphase, the DNA in Interphase is the period of growth and development for a cell. period of growth and development Interphase is the stages—rapid growth and most cells go through three During interphase, of DNA, the genetic information in a cell; replication of the organelles; replication and preparation for cell division. reproduces. During the mitotic phase, a cell and produce new cells. and produce new and the mitotic phase. phases of the cell cycle—interphase There are two main Most cells in an organism go through a cycle of growth, development, and division and division development, a cycle of growth, go through in an organism Most cells called the cell cycle. cells, develop, replace old or damaged cell cycle, organisms grow and Because of the preparation for mitosis. O s n A _ F Phases of Mitosis Organelle Replication Phases of Interphase Length of a Cell Cycle Phases of the Cell Cycle Phases of the Cell The Cell Cycle The Cell R
C _ 4. 1. 2. 1. 2. 3. 4. 5. 1. 2. 3. 1. 2. 2. 3. 4. 1. 1. 4. 5 T2 F. E. D. C. B. Lesson 1: The Cell Cycle and Cell Division and Cell Cycle Cell The 1: Lesson A. Lesson Outline for Teaching Teaching Outline for Lesson 6 0 _ 2 6 0 _ 4 0 2 CC204_062_065_CRF_AnsOut_891454.i62 62 CC204_062_065_CRF_AnsOut_891454.i63 63 2 0 4 _ 0 6 2 _ 0 6 5 _ C R
F Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. _ A n s O u t From a Cell to an Organism During mitosis,thenucleusanditscontentsdivideintwo. What happensduringmitosis? Discussion Question H. G. Lesson continued Outline _ 8 2. 1. 3. 2. 1. 4. 3. 9 1 4 Results ofCellDivision Dividing theCell’s Components 5 4 . i 6 3
multicellular organisms,replacementofworn-outordamagedcells,andrepair The cellcycleisimportantforreproductioninsomeorganisms,growth other andtotheoriginalcell,whichnolongerexists. The cellcycleresultsintwonewdaughtercellsthataregeneticallyidenticaltoeach cells form. In plantcells,a(n)cellplategrowsoutwardtowardanewwalluntiltwo membrane comestogethertodividethecell. In animalcells,a(n)furrowinthemiddleofcellsgetsdeeperuntilcell membrane aroundeachdaughtercell. After mitosis,cytokinesisusuallydividesacell’s cytoplasm,forminganewcell During telophase,chromosomesbegintouncoil,andtwonewidenticalnucleiform. are pulledinoppositedirectionsbythespindlefibers. During anaphase,sisterchromatidsineachduplicatedchromosomeseparateand damaged tissues. 6 3 99/26/09 1:10:34AM / T3 2 6 / 0 9
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