BIS2C_Lect26_Ward_Development___Sponges_ppt

Ucdavisedudevbio gastrulation formation of cell

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Unformatted text preview: ttp://learning.ucdavis.edu/DevBio/ Gastrulation: formation of cell layers by invagination of blastula to form gastrula 1 Diploblastic - two cell layers Triploblastic - three cell layers Endoderm - interior Ectoderm - exterior Mesoderm - develops in different ways - between ectoderm and endoderm Animal Development Animal Development Gastrulation: formation of cell layers by invagination (in-pocketing) of blastula to form gastrula Gastrulation: formation of cell layers by invagination (in-pocketing) of blastula to form gastrula Diploblastic animals: two cell layers formed, ectoderm and endoderm Triploblastic animals: three cell layers formed, ectoderm, endoderm and mesoderm blastula blastula blastula ? diploblasty gastrula ? diploblasty gastrula triploblasty 2 Clicker Question 1. Which of the following statements is false? a. Animals exhibiting a blastula stage of development Animals exhibiting blastula stage of development form a monophyletic group. b. Animals exhibiting a gastrula stage of development form a paraphyletic group. c. An...
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This note was uploaded on 08/07/2012 for the course BIS BIS 2C taught by Professor 3differentprofs during the Spring '09 term at UC Davis.

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