BIOL110s05-23 - BIOL 110: Principles of Biology Spring 2005...

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1 BIOL 110 : Principles of Biology Spring 2005 Lecture 23, M 3/28/05 http://www.smccd.net/accounts/staplesn/biol110/ ONLINE Quizzes (bi-weekly) from now on! Link TO QUIZZES: (Cañada College I.D. for login and password) http://smcwebtest.smccd.net/accounts/staplesn/index.tpx Time-limited (so study well first!); ~ 30 minutes to complete; once only. You must take Quiz 4 by Wed night!! Midterm 2 back Wed. or Fri. Journal Reports #1 Due this week!! REVIEW: Ch. 8: Genetics: Observing Patterns of Inherited Traits. – Exceptions/Beyond Mendel – Incomplete Dominance, Codominance, Pleiotropy, – Environment, Continuous Variation, Sex-Determination TODAY: Ch. 9: DNA Structure & Function – What is the Hereditary Material – What is the Structure of DNA? – How is DNA copied/replicated? – How are organisms Cloned?
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2 DNA Structure & Function Chapter 9 Mystery of the Hereditary Material Originally believed to be an unknown class of proteins • Thinking was: –Heritable traits are diverse –Molecules encoding traits must be diverse –Proteins are made of 20 amino acids and are structurally diverse
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3 Structure of the Hereditary Material • Experiments in the 1950s showed that DNA is the hereditary material • Scientists raced to determine the structure of DNA 1953 - Watson and Crick proposed that DNA is a double helix I. Frederick Griffith Discovers Transformation • 1928 • Attempting to develop a vaccine • Isolated two strains of Streptococcus pneumoniae Rough strain was harmless Smooth strain was pathogenic
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BIOL110s05-23 - BIOL 110: Principles of Biology Spring 2005...

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