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#positive feedback

2 public questions tagged with this topic.

Runaway selection involves positive feedback between:

Male trait and female preference reflects key principle in quiz on sexual selection + pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Male trait and female preference aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Male trait and female preference fits helps integrate natural selection, drift and species concepts essential for NEET, CSIR-NET and GATE examinations

Ref: Andersson, Sexual Selection, Princeton, Mate Choice and Good Genes.

Positive feedback in signaling leads to

Positive feedback loops in which an intermediate activates its own production can generate bistability—two stable steady states corresponding to “off” and “on.” Once a threshold is crossed the system flips irreversibly into the on state and remains there even after the original stimulus is removed. Such ultrasensitive, switch-like behavior is used to convert graded inputs into all-or-none cellular decisions.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)