Oct2LecNotes - October 2nd 2008 Notes taken by Dr Balko...

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October 2 nd 2008 Notes taken by Dr Balko (ppt) Routine Class Matters ~ Reading assignments for Today: chp 8 Intro Essay through 8.7 and 8.11-8.18 (not everything as in syllabus) ~ emphasize parts discussed in lecture. ~ finish biodiversity portion of course. For Thursday READ Chp 8 nto essay through 8. And 8.11-8.18 (only these sections) Reading assignment for next Tues is Chp 9 Intro Essay through 9.8 and 9.11 through 9.24. Our gal is to provide the background information needed to examine evolution. Prelim I results are posted on BLACKBOARD [grades are listed according to the ID number you entered on your scantorn (they are read and reported by computer) After fall break we’ll tackle evolution ~ make note of days off around fall break (ppt) Reproduction, genetics and sea urchins (Figure 8.0x from Campbell 4 th ed). Graphic depicts the early stages of development (cleavage, blastula, Gastrula and Organogenesis/neurulation). (ppt) Clicker Ques Answer = A BEST answer because they are BOTH Amniotes. 1
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October 2 nd 2008 Notes taken by Dr Balko (ppt) Reproduction, genetics and sea urchins (ppt slide revisited) How do sea urchins fit in?? They serve as a model system for studying early development in animals [Ontogeny recapitulates phylogeny = if we examine early developmental stages in a human, we go through the same stages represented on this slide depicting sea urchin early development] Zygote Mitosis Cleavage (solid ball of dividing cells) Mitosis Blastula (hollow sphere of cells) Gastrula (Archenteron forms—in folding) Organogenesis / Neurulation (larval form develops) (ppt) Cell division in the form of Mitosis – one diploid cell produces two identical diploid daughter cells. (ppt) Prokaryotes – bacteria (Figure 8.3B) Mitosis occurs in the form of Binary Fission. Forms two identical daughter cells from original cell (see text book and ppt slide). Binary Fission (mitosis) = asexual reproduction in bacteria. (ppt) Cell division in Prokaryotes is shown schematically in this slide. (Figure 8.3A) Know key events of Binary Fission o Duplication of DNA to prepare for cell division Simple process since there is not a lot of DNA present (single chromosome) 2
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October 2 nd 2008 Notes taken by Dr Balko (ppt) [more complicated due to greater number of chromosomes ~ in the diploid condition there are homologous pairs of chromosomes] [Figure 8.4A] DNA is replicated before entering the M-phase (division) of cell cycle. DNA organizes into chromosomes when the cell enters the cell division stage (M-phase) of cell cycle. When not dividing, DNA is found in loosely packed
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This note was uploaded on 10/21/2009 for the course BIO G 109 at Cornell University (Engineering School).

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Oct2LecNotes - October 2nd 2008 Notes taken by Dr Balko...

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