V Figure 33.8 The life cycle of the hydrozoan Obelia. The polyp is asexual, and the medusa is sexual, releasing eggs and sperm. These two stages alternate, one producing the other. O other polyps, specialized for reproduction, lack tentacles and produce tiny medusae by asexual budding. O Medusae swim off, grow, and reproduce sexually. Some of the colony's polyps, equipped with tentacles, are specialized for feeding. Reproductive polyp Feeding polyp- A colony of interconnected polyps (inset, LIM) results from asexual -Medusa bud MEIOSIS Goriad Medusa reproduction by budding. Egg Sperm SEXUAL REPRODUCTION ASEXUAL REPRODUCTION (BUDDING) Portion of a colony of polyps FERTILIZATION Zygote Developing polyp Planula (larva) Mature polyp Key OThe planula eventually settles and develops into a new polyp. O The zygote davalops into a solid ciliated larva called a planula. Haploid (n) Diploid (2n) MAKE CONNECTIONS> Compare and contrast the Obelia life cycle to the life cycles in Figure 13.6. Which life cycle in that figure is mast similar to that of Obelia? Explain (See ako Figure 29.3)

V Figure 33.8 The life cycle of the hydrozoan Obelia. The polyp is asexual, and the medusa is sexual, releasing eggs and sperm. These two stages alternate, one producing the other. O other polyps, specialized for reproduction, lack tentacles and produce tiny medusae by asexual budding. O Medusae swim off, grow, and reproduce sexually. Some of the colony's polyps, equipped with tentacles, are specialized for feeding. Reproductive polyp Feeding polyp- A colony of interconnected polyps (inset, LIM) results from asexual -Medusa bud MEIOSIS Goriad Medusa reproduction by budding. Egg Sperm SEXUAL REPRODUCTION ASEXUAL REPRODUCTION (BUDDING) Portion of a colony of polyps FERTILIZATION Zygote Developing polyp Planula (larva) Mature polyp Key OThe planula eventually settles and develops into a new polyp. O The zygote davalops into a solid ciliated larva called a planula. Haploid (n) Diploid (2n) MAKE CONNECTIONS> Compare and contrast the Obelia life cycle to the life cycles in Figure 13.6. Which life cycle in that figure is mast similar to that of Obelia? Explain (See ako Figure 29.3)

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter28: Invertebrates

Section: Chapter Questions

Problem 5RQ: The large central opening in the parazoan body is called the: gem mule spicule ostia osculum.

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