Allelic exclusion

Most T cells fully rearrange and express a TCR chain from only one of their two TCR alleles

TLS Online TPP Program

#Id: 8438

#Unit 10. Ecological Principles

Where conditions for plant growth are less stressful, plants can evolve life history traits that fall along a continuum from competitors to ruderals.

TLS Online TPP Program

#Id: 8439

#Unit 10. Ecological Principles

Without the abiotic stressors and without frequent disturbances, plants can grow rapidly for long periods of time, and this creates more competition among plants for soil nutrients and light.

Competitors also tend to grow to larger sizes and exhibit long life spans.

TLS Online TPP Program

#Id: 8440

#Unit 10. Ecological Principles

Source–sink metapopulation model - A population model that builds on the basic metapopulation model and accounts for the fact that not all patches of suitable habitat are of equal quality.

TLS Online TPP Program

#Id: 8441

#Unit 10. Ecological Principles

Landscape metapopulation model - A population model that considers both differences in the quality of the suitable patches and the quality of the surrounding matrix.

TLS Online TPP Program

#Id: 8442

#Unit 10. Ecological Principles

The proportion of occupied patches will stabilize over time to =1− (x/m)

x - Extinction rate 

m - Rate of movement between patches

TLS Online TPP Program

#Id: 1863

#Unit 10. Ecological Principles

Intraspecific Competition- Between individuals of the same species.   

Interspecific Competition- Between individuals of different species.