Biology2e-OP-1105-CH10.pdf - Chapter 10 | Cell Reproduction...

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10|CELLREPRODUCTIONFigure 10.1A sea urchin begins life as a single diploid cell (zygote) that (a) divides through cell division to form twogenetically identical daughter cells, visible here through scanning electron microscopy (SEM). After four rounds of celldivision, (b) there are 16 cells, as seen in this SEM image. After many rounds of cell division, the individual developsinto a complex, multicellular organism, as seen in this (c) mature sea urchin. (credit a: modification of work by EvelynSpiegel, Louisa Howard; credit b: modification of work by Evelyn Spiegel, Louisa Howard; credit c: modification of workby Marco Busdraghi; scale-bar data from Matt Russell)Chapter Outline10.1: Cell Division10.2: The Cell Cycle10.3: Control of the Cell Cycle10.4: Cancer and the Cell Cycle10.5: Prokaryotic Cell DivisionIntroductionA human, like every sexually reproducing organism, begins life as a fertilized egg (embryo) orzygote. In ourspecies, billions of cell divisions subsequently must occur in a controlled manner in order to produce a complex,multicellular human comprising trillions of cells. Thus, the original single-celled zygote is literally the ancestorof all cells in the body. However, once a human is fully grown, cell reproduction is still necessary to repair andregenerate tissues, and sometimes to increase our size! In fact, all multicellular organisms use cell division forgrowth and the maintenance and repair of cells and tissues. Cell division is closely regulated, and the occasionalfailure of this regulation can have life-threatening consequences. Single-celled organisms may also use celldivision as their method of reproduction.10.1|Cell DivisionBy the end of this section, you will be able to do the following:Describe the structure of prokaryotic and eukaryotic genomesDistinguish between chromosomes, genes, and traitsDescribe the mechanisms of chromosome compaction

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Term
Fall
Professor
Hogan
Tags
Cell Cycle, DNA, Mitosis, Cell reproduction

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