During cell migration, a tensile force is generated which physically distorts the prodomain and frees the active TGF-β dimer, initiating TGF-β signaling.

TLS Online TPP Program

#Id: 5492

#XL - T Zoology

TLS Online TPP Program

#Id: 5493

#XL - T Zoology

If survival of juveniles and adult is poor - Selection favors a single act of reproduction

TLS Online TPP Program

#Id: 5494

#XL - T Zoology

If survival of juveniles is very poor and unpredictable but adult are more likely to survive - Selection favors repeated reproduction and long reproductive life.

TLS Online TPP Program

#Id: 5495

#XL - T Zoology

Under favorable circumstances, the same per unit biomass of annuals produces more seeds than the same per unit biomass of trees. 

TLS Online TPP Program

#Id: 5496

#XL - T Zoology

k-selected species

Stable populations adapted to exist at or near the carrying capacity, K

Grow slowly and reach reproductive age late, having to devote much energy to growth and maintenance

K-selected species like a tree grows large and outcompeting  other  species

Such trees have a long-life span and produce seeds repeatedly when mature

These seeds are bigger

Nonrandom matting

TLS Online TPP Program

#Id: 5497

#XL - T Zoology