A third fate that can befall a duplicated gene is neofunctionalization. Here the duplicate evolves a novel biological function. 

TLS Online TPP Program

#Id: 5525

#Unit 10. Ecological Principles

Survivorship curves 

TLS Online TPP Program

#Id: 2130

#Unit 8. Inheritance Biology

Heterozygous for inversions also exhibit reduced recombination among genes located in the inverted region.

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#Id: 3239

#Unit 4. Cell Communication and Cell Signaling

miR-21 targets tumor-suppressor gene PTEN phosphatase

TLS Online TPP Program

#Id: 7101

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 7114

#Unit 6. System Physiology – Plant

In the absence of ethylene, ETR1 and the other ethylene receptors activate the kinase activity of CTR1. This leads to a repression of the ethylene response pathway, possibly through a MAP kinase cascade. 

The binding of ethylene to the ETR1 dimer results in its inactivation, which causes CTR1 to become inactive.