BIOL 111 Lecture : week 9.docx
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9. 1 cell division and mitosis: describe the organization of genetic material in a cell, describe the events that occur during the cell cycle including dna replication and mitosis. Single-celled organisms like bacteria, yeast and some protists reproduce every time a cell divides. In multicellular organisms cell divisions leads to an increase in size of the organism (growth) or can replace dead or injured cells (repair). http://www. microscopy-uk. org. uk/mag/artsep01/amoeba. html. Dna is de-condensed (big ball of string) while it is being copied. It only condenses into chromosomes after it has been replicated. Movement of the two copies of the dna (chromatids) to opposite ends of the cell. Proteins called microtubules attach to duplicated chromosomes, and pull them apart so that one copy of chromosome goes to each end of cell. Cleavage of the cell into two daughter cells. Genome=sum of all genetic material in a cell, i. e. , all the dna,
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