biology lecture 11

biology lecture 11 - 1 Pre-lecture vocabulary It is...

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Unformatted text preview: 1 Pre-lecture vocabulary It is expected that you understand the following basic terms and concepts prior to this lecture. Embryonic Zygote Embryo Symbiosis Symbiosis Parasitism Lecture 11 Oct 11, 2011 Cnidarians & Platyhelminthes Embryonic development, symmetry & parasitism 2 Which is NOT a characteristic of an animal? 1 No cell wa 71% 1. No cell wall 2. Heterotrophic 3. Haploid multicellular stage 4. Motile at some life N o c e l l w a l l H e t e r o t r o p h i c H a p l o i d m u l t i c . . . M o t i l e a t s o m e . . . E u k a r y o t i c 10% 9% 4% 6% 4. Motile at some life stage 5. Eukaryotic Animal Characteristics 1) Eukaryotic 2 Heterotrophi 2) Heterotrophic 3) Multicellular 4) No cell walls 5) Motile at some life stage 6) Diploid somatic cells 7) Diplontic life cycle * Most animals also have tissues * Most undergo unique embryonic development pattern 3 Lecture Outline Embryonic developmen Embryonic development Body form symmetry Cnidarians Platyhelminthes Embryonic development Zygote multicellular organism 2N Zygote = diploid cell resulting from union of Embryo = young animal or plant while it is still contained within a protective structure (e.g. seed coat, egg shell or uterus) two haploid gametes; 1 st cell of 2 nd generation 4 2 major processes occurring 2 major processes occurring during embryonic development 1. cleavage = cell division process forming many cells from one cell 2. gastrulation = in-folding process forming embryonic tissue layers (2-3) from one layer of cells cleavage 2-cell stage 8-cell stage morula gastrulation zygote (solid ball) blastula (hollow ball) early gastrula late gastrula 5 Gastrula layers of embryonic cells = germ layers 6 Germ Layers Ectoderm epidermis, nervous system Germ Layers Endoderm lining of digestive and respiratory system Organisms with 2 germ layers are diploblastic 7 Germ Layers Mesoderm Most internal organs: muscles, skeletal system, heart, stomach Organisms with 3 germ layers are triploblastic Archenteron digestive space (gut cavity) Blastopore mouth or anus 8 Gastrulation in sea star embryo So whats the big deal?!!...
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biology lecture 11 - 1 Pre-lecture vocabulary It is...

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