biology lecture 12

biology lecture 12 - Pre-lecture vocabulary It is expected...

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1 Pre-lecture vocabulary It is expected that you understand the following basic terms and concepts prior to this lecture. Coelom Protostome Deuterostome Locomotion Segmentation Lecture 12 Nematodes & Annelids Embryonic development: formation of digestive tract & body cavities, body segmentation Oct. 13, 2011
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2 cleavage 2-cell stage 8-cell stage morula gastrulation zygote (solid ball) blastula (hollow ball) early gastrula late gastrula Which of the following correctly identifies the embryonic features highlighted below? 8% A. 1 = endoderm, 2 = ectoderm, 3 = mesoderm, 4 = archenteron, 5 = blastopore 5% 56% 13% B. 1 = ectoderm, 2 = endoderm, 3 = mesoderm, 4 = blastopore, 5 = archenteron C. 1 = ectoderm, 2 = mesoderm, 3 = endoderm, 4 = archenteron, 5 = blastopore D. 1 = endoderm, 2 = mesoderm, 3 = ectoderm, 4 = blastopore, 5 = archenteron 18% gastrula 1 2 3 4 5 E. 1 = ectoderm, 2 = mesoderm, 3 = endoderm, 4 = blastopore, 5 = archenteron
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3 Which of the following correctly define the organisms discussed last class? 10% 1. Cnidarians: Diploblastic, radially symmetrical; Platyhelminthes: Diploblastic, radially symmetrical 6% 6% 10% 2. Cnidarians: Diploblastic, bilaterally symmetrical; Platyhelminthes: Diploblastic, bilaterally symmetrical 3. Cnidarians: Triploblastic, bilaterally symmetrical; Platyhelminthes: Triploblastic, bilaterally symmetrical 4. Cnidarians: Triploblastic, bilaterally symmetrical; Platyhelminthes: Triploblastic, radially symmetrical Cnidarians: Diploblastic, radially symmetrical; Platyhelminthes: 69% Triploblastic, bilaterally symmetrical Lecture Outline How digestive tract develops – • How digestive tract develops – embryonic development part 2 • Body cavities • Nematodes Annelid • Annelids
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4 Development of a digestive tract enables • specialization of gut regions • sequential food processing • continuous operation stomach anus mouth pharynx intestine How does a complete digestive tract develop? second opening first opening (blastopore) digestive cavity or tract
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5 Two ways to develop a digestive tract 1. Protostomes “1 st is mouth” anus 2. Deuterostomes mouth blastopore Æ mouth new opening Æ anus “2 nd mouth 2.
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This note was uploaded on 11/02/2011 for the course BIOL BIOL 111 taught by Professor Roffey during the Fall '09 term at McGill.

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biology lecture 12 - Pre-lecture vocabulary It is expected...

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