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TLS Online TPP Program

#Id: 7230

Three signals are required for activation of a naïve T cell


#Unit 5. Developmental Biology #Major histocompatibility complex #Part B Pointers
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TLS Online TPP Program

#Id: 3880

#Unit 5. Developmental Biology

Slug migrates to the top layer of the soil, where it proceeds to build the fruiting structure.
TLS Online TPP Program

#Id: 4734

#Unit 5. Developmental Biology
TLS Online TPP Program

#Id: 4735

#Unit 5. Developmental Biology

In C. elegans
When sperm fuses with the egg cell membrane, polyspermy is prevented by the rapid synthesis of chitin by the newly fertilized egg.
TLS Online TPP Program

#Id: 4736

#Unit 5. Developmental Biology

The zygote of C. elegans exhibits rotational holoblastic cleavage.
TLS Online TPP Program

#Id: 4737

#Unit 5. Developmental Biology

During early cleavage, each asymmetrical division produces:

  • One founder cell (denoted AB, E, MS, C, and D) that produces differentiated descendants
  • One stem cell (the P1–P4 lineage) 
TLS Online TPP Program

#Id: 4738

#Unit 5. Developmental Biology

The anterior-posterior axis is determined before the first cell division, and the cleavage furrow is located asymmetrically along this axis of the egg, closer to what will be the posterior pole.