Cooperation and selfishness both benefit the donor and therefore should be favoured by natural selection.

TLS Online TPP Program

#Id: 8429

#Unit 10. Ecological Principles

Trade off - A giving up of one thing in return for another.

Causes of trade off

More mortality in their offspring 

Limitation of food

TLS Online TPP Program

#Id: 9054

#Unit 4. Cell Communication and Cell Signaling

The activated β2-adrenergic receptor induces GDP-->GTP exchange on a stimulatory G protein (Gs).

TLS Online TPP Program

#Id: 1243

#Unit 7. System Physiology – Animal

FSH & LH control growth of the ovaries and testes.

TLS Online TPP Program

#Id: 7426

#Unit 5. Developmental Biology

During growth, unicellular D. discoideum monitor their cell density relative to that of their bacterial food source by secreting a glycoprotein called prestarvation factor at a constant rate.

TLS Online TPP Program

#Id: 6051

#Unit 10. Ecological Principles

Grasslands   Grasslands are found on every continent except Antarctica, and cover about 16 per cent of the Earth’s surface.  They develop where there is not enough precipitation to support forests, but enough to prevent deserts forming.