ch12 - The Cell Cycle Chapter 12 Objectives Describe binary...

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The Cell Cycle: Chapter 12 Objectives Describe binary fission in bacteria Describe the structures that play roles in the mitotic phase of the cell cycle: the centrioles, spindle microtubules and chromosomes Outline the phases of the cell cycle Describe the factors that control cell growth and how cancer results from a breakdown of this control Outline the general progression and overall results of meiosis, contrasting them with mitosis Introduction Life cycle is sequence of life forms from one generation to next Sexual reproduction Asexual reproduction Like beget like (more or less) if reproduce asexually single-celled organisms reproduce asexually by dividing in two offspring of multi-cellular organisms not genetically identical to parents Cells arise from preexisting cells cell reproduction two roles Binary Fission Bacterial chromosomes genes carried on single circular DNA molecule Asexual minimal packaging prior to cell division, genome copied cell elongation and formation of plasma membrane plasma membrane pinches through cell Eukaryotic Cell Division Eukaryotes have large, complex, multiple chromosomes Human cells contain about 30,000-50,000 genes Organized into separate, linear chromosomes DNA complexed with proteins Just prior to division, chromosomes become visible Somatic cells vs sex cells (diploid) (haploid)
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Prior to cell division…..
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