L17 animal reproduction

L17 animal reproduction - Chapters 51 52 Lecture Guide...

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Chapters 51 & 52 Lecture Guide Asexual Reproduction Common in many invertebrates Types Fission: e.g., anemones, Planaria, coral Budding: e.g., hydra, anemone Fragmentation/regeneration: e.g. sea stars Internal budding (gemmules): e.g., sponges Two from one: Fission of a sea anemone ( Anthopleura elegantissima ) Fission in Planaria Hydra Budding Fragmentation/Regeneration of Sea Stars Gemmules Parthenogenesis Asexual reproduction by the females of some species Involves the development of offspring from an unfertilized haploid egg E.g., honey bees, whiptail lizards Sexual Reproduction: Variations Hermaphrodites Single individuals produce both sperm and eggs sessile (immobile) hard to find a mate, e.g., pond snails and tapeworms Some self-fertilize, but most must mate with another, e.g., earthworms Sequential hermaphrodites (can change gender) e.g. .bluehead wrasse Sexual Reproduction: External Fertilization Joining of egg and sperm outside the body Release of egg and sperm usually happens in water, so the sperm can swim to the egg Most species live always in the water Some, like the frog, may live around the water on land, but they must return to the water to mate
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This note was uploaded on 10/28/2011 for the course BIO 183 taught by Professor Parks during the Spring '07 term at N.C. State.

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L17 animal reproduction - Chapters 51 52 Lecture Guide...

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