lecture_notes_10_12_07

lecture_notes_10_12_07 - Life Cycles outline - Lecture 2...

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Life Cycles outline - Lecture 2 2007 Life Cycles [Reading: SS 33-39; CR 238-243, 561-562, 576-577] Two important consequences of life cycles (and of life) 1) Exposure of individuals to their environments 2) Generation of progeny Two general categories of life cycles - Asexual and sexual The asexual lifestyle: reproduction by mitosis 1) Fission in bacteria 2) Budding in yeast 3) Apomixis in plants (asexual production from tubers, bulbs, seeds, etc.) 4) Parthenogenesis in animals (development of an individual from an egg without fertilization) Consequences of asexual reproduction: Genetically constant from generation to generation Consequently relies upon fitness (relative competitiveness, esp. regarding number of progeny) of existing individuals No opportunity to combine favorable mutations from two individuals (no recombination) The sexual lifestyle: The power of two Individuals are the product of two parents with an equal genetic contribution from each Two key events break up the sexual life cycle
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This note was uploaded on 04/29/2008 for the course BIOCORE 301 taught by Professor Howell during the Fall '07 term at Wisconsin.

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lecture_notes_10_12_07 - Life Cycles outline - Lecture 2...

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