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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
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.
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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.
- Spring '09