BIOB50H3 Lecture Notes - Lecture 6: Asexual Reproduction, Phenotypic Plasticity, Polyphenism

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11 Feb 2013
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An organism s life history is a record of events relating to its growth, development, reproduction, and survival. Life history strategy: timing and division of resources. Organisms do things in order to maximize bene t. Phenotypic plasticity: one genotype may produce different phenotypes under different environmental conditions. Animals change they way they look, behave, depending on the context. Phenotypic plasticity may produce a continuous range of growth rates; or discrete types-morphs. Polyphenism: a single genotype produce several distinct morphs. Produce 2 very different looking individuals depending on the environment. Organisms use different strategies to optimize bene t in different environments. Organisms have evolved many different modes of reproduction. Asexual reproduction: simple cell division- all prokaryotes and many protists. Some multicellular organisms reproduce both sexually and asexually (eg. corals) Some use both strategies in order to maximize bene ts of asexual and sexua reproduction. Asexual reproduction is much faster than sexual reproduction. Individuals can take advantage of more complex environments.

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