20.3

Question 1

pattern formation

Answer 1

created the body plan of an organism
*depends on differential gene expression based on location within the embryo
*established A/P, D/V and L/R body axes

Question 2

morphogenesis

Answer 2

generation of organisms body form
depends on:
-cell growth
-cell division
-cell migration
-changes in cell shape
-apoptosis

Question 3

morphogenesis involves cell migration

Answer 3

cell surface adhesion proteins bind and release the extracellular matrix

Question 4

morphogenesis involves changes in cell shape

Answer 4

cell shape and structure are associated with cell function

Question 5

morphogenesis involves apoptosis

Answer 5

necrosis: caused by injury- cell membrane bursts- contents are release
apoptosis-induced by cell death pathway- cell fragments into apoptotic bodies-fragments recycled