KA 2: evolution: co-evolution

Question 1

what is co-evolution?

Answer 1

the process where two or more species evolve in response to selection pressures imposed by each other

Question 2

a change in the traits of one species acts as…

Answer 2

a selection pressure on the other species

Question 3

where is co-evolution frequently seen?

Answer 3

in pairs of species that have symbiotic interactions

Question 4

what is symbiosis?

Answer 4

co-evolved intimate relationship between members of two different species

Question 5

what can the impacts of these relationships be?

Answer 5

• positive (+)
• negative (-)
• neutral (0)

Question 6

give the types of symbiotic interactions

Answer 6

-mutualism
-commensalism
-parasitism

Question 7

what is mutualism?

Answer 7

both organisms in the interaction are interdependent on each other for resources or other services

both organisms gain from relationship=> interaction is (+/+)

Question 8

what is commensalism?

Answer 8

only one of the organisms benefits (+/0)

Question 9

what is parasitism?

Answer 9

the parasite benefits in terms of energy or nutrients and the host is harmed as the result of the loss of these resources (+/-)

Question 10

what does The Red Queen hypothesis state?

Answer 10

in a co-evolutionary relationship, change in the traits of one species can act as a selection pressure on the other species

Question 11

what does the red queen hypothesis mean?

Answer 11

that species in these relationships must adapt to avoid extinction