Mitosis - Biology 111, Principles of Biology Lecture...

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Biology 111, Principles of Biology Lecture Outlines There are two basic mechanisms by which organisms reproduce: ASEXUAL reproduction involves only a single parent (e.g. cell division) Progeny are genetically identical to the parent Each parent makes an equal genetic contribution to the offspring Except in true-breeding lines, offspring tend to show variability among individuals Except in true-breeding lines, offspring tend to be different from parents At the cellular level, both sexual and asexual reproduction require a division of cellular contents (organelles and chromosomes) between progeny cells. Prokaryotes Eukaryotes DNA free in cytoplasm DNA enclosed in nucleus SINGLE circular DNA molecule MULTIPLE linear DNA molecules PLASMIDS (mini-chromosomes), usually many copies (30 - 200) Generally NO plasmids DNA segregated by attachment to the cell membrane DNA segregated by attachment to spindle--a microtubule structure designed to move chromosomes One primary "signal" for cell division is related to SIZE: In the life-cycle of cells, they first grow and then they divide.
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This note was uploaded on 04/17/2008 for the course BIOL 111 taught by Professor Lux during the Fall '07 term at Lander.

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Mitosis - Biology 111, Principles of Biology Lecture...

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