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TLS Online TPP Program

#Id: 5756

Clement’s organismic model- Competition causes sharp boundaries between groups of species; certain species group together.

#Unit 10. Ecological Principles #Community structure and attributes #Part B Pointers
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TLS Online TPP Program

#Id: 1591

#Unit 5. Developmental Biology

Hensen’s node (Primitive Knot)
TLS Online TPP Program

#Id: 1592

#Unit 5. Developmental Biology

A regional thickening of cells at the anterior end of the primitive streak
TLS Online TPP Program

#Id: 1593

#Unit 5. Developmental Biology

Hensen’s node is the functional equivalent of the organizer (dorsal lip of the amphibian blastopore)
TLS Online TPP Program

#Id: 1594

#Unit 5. Developmental Biology

Primitive Pit 
A funnel-shaped depression at the center of Hensen’s node through which cells migrate to form the notochord and prechordal plate.
TLS Online TPP Program

#Id: 1595

#Unit 5. Developmental Biology

The primitive streak defines the major body axes of the avian embryo. 
TLS Online TPP Program

#Id: 1596

#Unit 5. Developmental Biology

The axis of the primitive streak is equivalent to the dorsal-ventral axis of amphibians.