Selection pressures Flashcards
What is biological control
the introduction of a negative selection pressure to avoid uncontrolled population growth of an organism.
What is a selection pressure
an evolutionary force that causes a particular characteristic to be more favourable
Why have cane toads spread in australia
can toad was introduced to reduce cane toad numbers
spread because: no natural predators, high rate of reproduction –> becomes most suited to the environment
What is a biological control techniques used on the prickly pear
The prickly pear is a highly invasive weed that has tough seeds (+ve selection pressure) that allow it to spread through the feces of other animals. Was well suited to climate of australia (+ve selection pressure) cactoblastis moths (-ve selection pressure) were introduced to reduce pear population where it ate the prickly pear from the inside out.
When explaining cane toad, prickly pear or biological control what do you link to?
selection pressure selection pressure selection pressure
