Regional specificity of induction:

mesenchyme plays an instructive role, calling into play different sets of genes in the responding epithelial cells.

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: 5519

#Unit 10. Ecological Principles

Age-specific fertility and survivorship data help determine net reproductive rate (R₀).

TLS Online TPP Program

#Id: 6369

#Unit 2. Cellular Organization

When polymerase binding causes transition to the open complex and initiates transcription. This gives a low level of constitutive expression called the basal level.  Binding of RNA polymerase is the rate-limiting step in this case.

TLS Online TPP Program

#Id: 1012

#Unit 5. Developmental Biology

In mammals, the bipotential gonad appears to be moved into the male pathway (testis development) by the Sry gene (on the Y chromosome), which triggers the activity of Sox9.

TLS Online TPP Program

#Id: 10332

#Unit 4. Cell Communication and Cell Signaling