Lecture 12 - Lecture 12 Feb 1 Genetic Variation in Natural...

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1 Lecture 12: Feb. 1 Genetic Variation in Natural Populations: Key • Types of Cell Division -m itos is -b inaryf iss ion -me ios is • Meiosis = Sex (Really!) - the Red Queen Hypothesis -overv iewofme ios is -cross ingover - independent assortment - random fertilization Discussion Activity This Week ‘Huntington Disease’ article - read article before you come to discussion (week 5 folder) Check Qwizdom Points on SAMS https://cats.lsa.umich.edu/ Chapters 11 :228-236; 12 : 248-266 Biology in the News Mitosis - produces 2 genetically identical daughter cells - only in eukaryotes; only in somatic cells Types of cell division Meiosis - produces 4 daughter cells - daughter cells are genetically different - only in eukaryotes; only in germ cells Binary fission - produces 2 genetically identical cells - only in prokaryotes Key roles of mitosis
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2 Mitosis results in two daughter cells that are genetically identical - i.e., same set of chromosomes (barring any mistakes in DNA replication) occurs in all somatic cells (Euks) So how is this accomplished? follow figure 11.9 in text – shows stages and describes what happens in each Molecular details of motor proteins, cytoskeletons, kinetochores, controls of cell cycle will be covered in BIO 172 … cell cycle Distinction between chromosomes and chromatids prior to S phase of interphase after S phase of interphase is completed Know terms in Table 12.2 M I T O S I S Binary Fission
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3 Reproduction is a fundamental property of living things asexual sexual Asexual -one parent produces genetically identical offspring
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Lecture 12 - Lecture 12 Feb 1 Genetic Variation in Natural...

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