Lecture 9 - Reproduction Asexual Reproductionno fusion of...

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Reproduction Asexual Reproduction—no fusion of sex cells (gametes) Sexual Reproduction—union of gametes Asexual Reproduction Budding or Fragmentation Mitotic divisions give rise to clones Asexual Reproduction—Parthenogenesis (“Virgin Birth”) The Parthenon Temple of Athena Parthenos (“the Virgin”) in Athens Parthenogenesis Females produce eggs (usually by meiosis) which then develop without fertilization Reproduction in Honeybees --Queens (2n) produce eggs by meiosis --Workers (females, 2n) develop from fertilized eggs --Drones (males, n) develop from unfertilized eggs and produce sperm by mitosis Parthenogenesis --Some fish and reptiles are parthenogenetic --Evidence that parthenogenetic vertebrates arise as interspecific hybrids --“Life finds a way” --Jeff Goldblum, Jurassic Part Sexual Reproduction—Union of Gametes
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Most Real Sponges are Hermaphrodites—both male and female reproductive organs (Hermes and Aphrodite) The nudibranchs (sea slugs) are cross-fertilizing hermaphrodites What about self-fertilizing hermaphrodites? Do tapeworms reproduce sexually or asexually?—SEXUALLY Evolution and Sexual Reproduction --Sexual reproduction has costs—but is most common form of reproduction in animals—so it must have advantages (actually hard to prove mathematically)—Genetic Variability
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This note was uploaded on 04/06/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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Lecture 9 - Reproduction Asexual Reproductionno fusion of...

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