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DevBio Exam 2 questions with complete 
questions and answers { graded a+} 
Epiboly - the movement of epithelial sheets (usually ectodermal 
cells) that spread as a unit (rather than individually) to enclose the 
deeper layers of the embryo. 
What are 3 mechanisms in which epiboly can occur? - 1. by cells 
dividing 
2. by cells changing shape 
3. by several layers of cells intercalating into fewer layers 
Give 3 reasons why zebrafish are good models to study development. - 
1. brood size 
2. ...
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DevBio Exam 2 questions with complete 
questions and answers { graded a+} 
Epiboly - the movement of epithelial sheets (usually ectodermal 
cells) that spread as a unit (rather than individually) to enclose the 
deeper layers of the embryo. 
What are 3 mechanisms in which epiboly can occur? - 1. by cells 
dividing 
2. by cells changing shape 
3. by several layers of cells intercalating into fewer layers 
Give 3 reasons why zebrafish are good models to study development. - 
1. brood size 
2. ...