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TLS Online TPP Program

#Id: 533

Fold potential (measured in negative units) is high (more negative) in introns, and low (more positive) in exons.

#Unit 2. Cellular Organization #Genome #Part B Pointers
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TLS Online TPP Program

#Id: 2372

#Unit 5. Developmental Biology

 In planarian regeneration, an anterior polarity is dependent on repression of Wnt signaling, & allows head formation.
TLS Online TPP Program

#Id: 2373

#Unit 5. Developmental Biology

In regenerating planaria, Notum is activated in the anterior-facing blastema, which generates a head.
TLS Online TPP Program

#Id: 2374

#Unit 5. Developmental Biology

An anterior-to-posterior gradient of Erk signaling functions as a positive inducer of head specification
TLS Online TPP Program

#Id: 2375

#Unit 5. Developmental Biology

 Wnt signaling achieves its repression of head regeneration by inhibiting Erk
TLS Online TPP Program

#Id: 2376

#Unit 5. Developmental Biology

Regulation of the balance between Wnt and Notum signals underlie not only head-tail specification but also regulation of organ size.


 
TLS Online TPP Program

#Id: 2377

#Unit 5. Developmental Biology

Two distinct populations of neoblasts exist:
1. Sigma neoblast population 
2. Zeta neoblast population