Asexual Reproduction Sexual Reproduction (P 145, fig. 7.10) (P146, Figs. 7.15-7.16) Station 12 Phylum Cnidaria (Obelia) – is a marine, colonial animal that illustrates the phenomenon of alteration of generations because Obelia it alternates between the asexual polyp form and the sexual medusa form. You will be held responsible for the life cycle. Examine prepared slides of Obelia hydroids and their medusa. Be able to identify the Obelia following structures and know their functions: hydranth, gonangium, and the basal disc in the polyp, and tentacles, manubrium, radial canals, gonads, and mouth in the medusa. Medusa (P 146, Figs. 7.18-7.19) (P 147, Figs. 7.20-7.21) Station 13 Phylum: Ctenophora – Be able to recognize the example. What does the word ctenophore mean? How do these organisms differ from the Cnidarians? Station 14 Phylum: Platyhelminthes – What characteristic is responsible for the branching off of the flatworms from earlier animals? What of organization do these organisms demonstrate? How many tissue layers do these organisms have?
Asexual Reproduction Sexual Reproduction (P 145, fig. 7.10) (P146, Figs. 7.15-7.16) Station 12 – Phylum Cnidaria (Obelia) Obelia is a marine, colonial animal that illustrates the phenomenon of alteration of generations because it alternates between the asexual polyp form and the sexual medusa form. You will be held responsible for the Obelia life cycle. Examine prepared slides of Obelia hydroids and their medusa. Be able to identify the following structures and know their functions: hydranth, gonangium, and the basal disc in the polyp, and tentacles, manubrium, radial canals, gonads, and mouth in the medusa. Medusa (P 146, Figs. 7.18-7.19) (P 147, Figs. 7.20-7.21) Station 13 – Phylum: Ctenophora Be able to recognize the example. What does the word ctenophore mean? How do these organisms differ from the Cnidarians? Station 14 – Phylum: Platyhelminthes What characteristic is responsible for the branching off of the flatworms from earlier animals? What of organization do these organisms demonstrate? How many tissue layers do these organisms have?
bio2labpracticum3complete12.docx