Nov 05 2009

Nov 05 2009 - Reproduction & Mating Syst ems I (BIEB...

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Reproduction & Mating Systems I (BIEB 132) November 5 2009 (Hastings) Readings (for two lectures on Reproduction): 1) Levinton, Chapter 6, pp. 123-137 2) Knowlton, N. 2008. Coral reefs. Current Biology 18:R-18-R21 (assigned last week) 3) Duffy, J.E. 1996. Eusociality in a coral-reef shrimp. Nature 381:512-514 4) Warner, R.R. 1984. Mating behavior and hermaphroditism in coral reef fishes. American Scientist 72:128-136 Reproduction in marine organisms reflects, in part, phylogenetic constraints inherited from ancestors. Generally do not see marine representatives of terrestrial groups evolving entirely new reproductive strategies Marine mammals: internally fertilize, placenta, feed young with milk Sea turtles: bury leathery eggs in sand (like other turtles, lizards, etc) Seagrasses produce pollen and seeds like other flowering plants and also reproduce by vegetative growth Marine water striders (insects of genus Halobate s) attach eggs to flotsam Reproduction is highly varied in marine groups (expected given diversity of marine organisms) I. Sexual versus asexual reproduction A. Asexual reproduction - does not involve meiosis or gamete formation (generates offspring genetically identical to parent) Budding of new, independent individuals - common in anemones etc Solitary species: buds move away from parent Colonial invertebrates: buds remain next to parent Fragmentation: common in branching corals (esp. after storms) B. Sexual reproduction – meiosis & gamete formation; increases genetic variation II. Introduction to mating systems A. What is the essence of gender? Females have large (costly), gametes
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This note was uploaded on 02/23/2010 for the course BIEB BIEB 132 taught by Professor Hastings during the Fall '09 term at UCSD.

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Nov 05 2009 - Reproduction & Mating Syst ems I (BIEB...

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