BIOL202 - Study Guide - Lecture 21 - Species And Speciation

BIOL202 - Study Guide - Lecture 21 - Species And Speciation...

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STUDY GUIDE: LECTURE 21 SPECIES AND SPECIATION Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely the production of higher animals, directly follows. There is grandeur in this view of life, with its several powers, having been originally breathed into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being, evolved . Charles Darwin, 1859, Last paragraph of The Origin of Species Text Reading : Red/Black Campbell, 7 th ed., Chpt. 24, pgs. 472-478, Green Campbell, 6 th ed, 464-473 Supplemental Reading (on course website): Censky, E. et al. 1998. Overwater dispersal by lizards due to hurricanes. Nature 395 : 556. Supporting Websites (links also on the course website): http://www.blueplanetbiomes.org/african_elephant.htm http://www.blueplanetbiomes.org/african_forest_elephant.htm http://news.nationalgeographic.com/news/2001/08/0824_twoelephants.html http://news.nationalgeographic.com/news/2001/12/1217_leeelephant.html http://w--ww.pbs.org/wgbh/evolution/library/06/3/l_063_03.html This last site provides a very interesting example of how a rare trait, polydactyly -- extra fingers or sometimes toes – has become common in one human population through the process of a founder event and genetic drift. This site will be of special interest to students focused on human biology and pre-medicine. (Lots of) Terminology : systematics : The study of the evolutionary relationships among organisms.
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taxonomy : naming of living organism. conspecific vs. heterospecific (see last page of overheads) : Conspecific- belonging to same species Heterospecific- belonging to different species morphological species vs. biological species vs. genealogical species : M- individuals with same basic form B- do the sexy with different groups and produce viable offspring. G- share unique genetic markers viable (as in “viable” offspring) : surviving offspring zygote : a fertilized egg haplotype : different sequences of DNA reproductive isolating mechanism (RIM) : Prezygotic and postzygotic mechanisms. Pre: BGHMT(prevent mating) B ehavioral isolation- courting each other G ametic isolation- sperm is not universally accepted by all species H abitat isolation- same area different habitats M T emporal isolation- different breeding times. Post: ISB (prevent development of viable, fertile young. Hybrid
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This test prep was uploaded on 04/18/2008 for the course BIOL 202 taught by Professor Johnson during the Spring '05 term at Maryland.

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BIOL202 - Study Guide - Lecture 21 - Species And Speciation...

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