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BIO 110, Life Science

BIO 110, Life Science. Summer 2012. Readings. Text Review Chapter 8 pp. 617–620: Plant sex Wikipedia http://en.wikipedia.org/wiki/Honey_bee_life_cycle http :// en.wikipedia.org/wiki/The_birds_and_the_bees. Mutation and inheritance. Germ-line mutation Mutation during differentiation

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BIO 110, Life Science

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  1. BIO 110, Life Science Summer 2012

  2. Readings • Text • Review Chapter 8 • pp. 617–620: Plant sex • Wikipedia • http://en.wikipedia.org/wiki/Honey_bee_life_cycle • http://en.wikipedia.org/wiki/The_birds_and_the_bees

  3. Mutation and inheritance • Germ-line mutation • Mutation during differentiation • When mutation doesn’t matter

  4. Why sex? • Sex is the antidote to mutation • The tale of the clumsy scribe, Part II. • Meiosis and syngamy • Chromosomes • Haploid and diploid • Gametes and zygotes • Recombination

  5. Sex and multicellularity • Simplicity: the other advantage of sex • The “germ line” revisited • Mammals • Plants • Decay versus shuffle: how often to have sex

  6. Birds and bees, horses and alfalfa • ‘“The birds and the bees” is an English-language idiomatic expression that refers to courtship and sexual intercourse, and is usually used in reference to teaching someone, often a young child, about sex and pregnancy. The phrase is evocative of the metaphors and euphemisms often used to avoid speaking openly and technically about the subject.’ —Wikipedia

  7. Birds and horses • Gametes (egg and sperm) are the only haploid cells • Internal fertilization • Bird eggs, horse wombs • Sex determination

  8. Bees • Hive as organism • Diploid workers and queens • Haploid males (drones) Images from WikiMedia Commons; citations in alternate text

  9. Alfalfa • Gametophytes and sporophytes • Pollen is not “plant sperm”, it produces the sperm • Pollination

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