Bio 201 F09 True lect 14 (L14)v3r

Bio 201 F09 True lect 14 (L14)v3r - todays factoid Rat...

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Unformatted text preview: todays factoid Rat Neighborhoods story in Biology in the News on BB recent molecular gene9c popula9on study of rats in Bal9more most rats stay within a one block neighborhood a major waterway (Jones Falls) separates two very gene9cally dis9nct popula9ons of rats mid term 1 results Average: 74.16% Standard Devia9on: 15.74% Ctenophores Ctenophores: diploblasts with radial symmetry Ctenophores Comb Jellies (100% marine, free swimming, ~100 species known) Have muscle cells (ectomesoderm, transparent, jelly-like) Have complete [one- way] gut Mouth->anus (2 anal pores) Swim with oral side leading Plankton predators Ctenes plates of fused cilia Tentacles with colloblasts (sticky cells to catch prey) Feed on Zooplankton Small crustaceans Fish eggs and larvae No predators to control it where it invades Cnidarians Cnidarians: diploblasts with radial symmetry and huge diversity Jellyfsh, Anthozoa (anemones + coral) , Hydrozoa All aquatic (almost all marine) ~ 11,000 living species (~ 5000 Fossil sp.) Tissue Grade oF complexity Diploblastic - have outside (ectoderm) and inside (endoderm) Two Body Forms Polyp- Sessile Benthic (Anthozoans live like this.) Medusa- Planktonic (Jellyfsh live like this.) Many hydrozoans have both Forms in their liFe cycles Only 2 Cell Layers Thick rely on diffusion Epidermis outer Gastrodermis inner Mesoglea acellular matrix (jelly like texture) Both forms have radial symmetry Two-way (blind) gut -only one opening Tentacles with Cnidocytes around mouth Cnidocyte special cell with stinging organelle Nematocyst Cnidarian Calcium Carbonate (CaCO 3 ) structures are major structural components of coral reefs Create habitat for a huge diversity of species Threatened by many human activities Arrow worms (Phylum Chaetognatha)...
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Bio 201 F09 True lect 14 (L14)v3r - todays factoid Rat...

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