2h- Co-evolution

Question 1

What is co-evolution?

Answer 1

The process by which two or more species evolve in response to selection pressures imposed by each other

Question 2

What does a change in traits of one species act 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 relationships between members of two different species

Question 5

What can the impact of these symbiotic relationships be for the individuals involved?

Answer 5

Positive (+), negative (-) or neutral (0)

Question 6

What are three examples of symbiotic relationships?

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. As both organisms gain from the relationship, the 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 and what does this mean for the species involved?

Answer 10

That, in a co-evolutionary relationship, change in the traits of one species can act as a selection pressure on the other species. This means that species in these relationships must adapt to avoid extinction