There are three basic modes of selection on a quantitative trait.

TLS Online TPP Program

#Id: 1040

#Unit 5. Developmental Biology

The first visible sign of limb development is the formation of bilateral bulges called limb buds.

1. limb bud  is 

TLS Online TPP Program

#Id: 4027

#Unit 7. System Physiology – Animal

TLS Online TPP Program

#Id: 10152

#Unit 6. System Physiology – Plant

Strigolactones are perceived by a protein complex containing an a-/b-fold hydrolase protein and an F-box protein (D14 and MAX2, respectively)

TLS Online TPP Program

#Id: 9374

#Unit 4. Cell Communication and Cell Signaling

Like SOCS proteins in the cytokine signaling, 

Smad7 also recruits an E3 ubiquitin ligase that targets TGF-β receptors for degradation.

TLS Online TPP Program

#Id: 1561

#Unit 4. Cell Communication and Cell Signaling

Principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.