Bio 201 S10 Lect 7 (True) v2 alt no r

Bio 201 S10 Lect 7 (True) v2 alt no r - todaysfactoid

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today’s factoid New NSF‐funded research has discovered how the ulcer causing bacterium, Heliobacter pylori gets through the protec>ve mucus coa>ng the stomach wall to cause ulcers At the very acidic pH of the stomach, the protein mucin in mucus is normally thick and viscous, making it hard for the baceria to swim through the mucus But the bacterial cells are able to increase the pH in their immediate surroundings (making it less acidic) which acts to liquify the mucus, making it easer to swim through and aEack the cells lining the stomach story posted in ‘Biology in the News’ http://www.nsf.gov/news/news_summ.jsp? org=NSF&cntn_id=115409&preview=false
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in the assigned reading phylogenies Prof. Wiens will discuss this topic in more detail in the 2 nd half of course Here, we will just be using them in their most basic form to illustrate group rela>onships relationships based on similarities of traits morphological molecular (DNA sequence) at the tips are taxa (singular taxon ) taxon can be one of many different levels for example: species, genus, family, phylum (see next slide for plants)
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from Wikipedia
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reflects the same hypothesis as and and
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when you see more than two lineages coming from a single node polytomy (“star phylogeny”) relationships are as yet unresolved
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synapomorphies meaning: “shared derived characters” in simple terms, traits that two or more groups of organisms share that derive from a common ancestor cow, donkey and horse: all mammals; share fur, mammary glands inherited from a common ancestor ( 1 ) absent from birds donkey and horse are both
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This note was uploaded on 02/18/2010 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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Bio 201 S10 Lect 7 (True) v2 alt no r - todaysfactoid

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