Chapter 11 Lecture Outline

Chapter 11 Lecture Outline - Biology 100 Vandan Desai...

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Biology 100 Vandan Desai Chapter 11: The Cell Cycle (Lecture Outline) -------------------------------------------------------------------------------------------------------------------------- Cell Theory —all organisms are made of cells and all cells rise from preexisting cells Rudolf Virchow proposed that new cells arise through division of preexisting cells (cell division ) Microscopic observation of newly developing individuals (embryos ) confirmed Virchow’s hypothesis Researchers focused on the nuclei of dividing cells and the fate of the chromosomes o Chromosomes —carriers of hereditary material—instructions for building/operating cell In animals, two fundamentally different ways nuclei divide prior to cell division o Meiosis —leads to production of sperm and eggs —male/female reproductive cells (gametes ) o Mitosis —leads to production of all other cell types —somatic (“ body-belonging” ) cells In both kinds of cell division, parent cell is said to give rise to daughter cells Meiosis: o Type of nuclear division that leads to production of sperm and eggs o Amount of hereditary material found in the parent cell nucleus is reduced by half o Daughter cell that becomes sperm/eggs do not contain same genetic material as parent o Basis of
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Chapter 11 Lecture Outline - Biology 100 Vandan Desai...

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