No two different species can share the same niche but can have similar niches,  this is because of competition for resources like food, space etc

Two species cannot coexist permanently in a community if their niches are  identical

TLS Online TPP Program

#Id: 2370

#Unit 5. Developmental Biology

In planaria, Wnts functioning through β-catenin promotes tail development while repressing head regeneration

TLS Online TPP Program

#Id: 2371

#Unit 5. Developmental Biology

In regenerating planaria, β-catenin is activated in the posterior-facing blastema, which generates a tail.

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