2.2c Co-evolution

Question 1

Co-evolution definition

Answer 1

Co-evolution is the process by which two or more species evolve in response to selection pressures imposed by each other.

Question 2

Co-evolution

Answer 2

A change in traits of one species acts as a selection pressure on the other species.
Co-evolution is often seen in pairs of species that have symbiotic interactions.

Question 3

Symbiotic relationships

Answer 3

The impacts of these relationships can be positive (+), negative (-), or neutral (0) for the individuals involved.

Mutualism, commensalism and parasitism are types of symbiotic relationships.

Question 4

Symbiosis definition

Answer 4

Co-evolved intimate relationships between members of two different species.

Question 5

Mutaulism

Answer 5

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 6

Commensalism

Answer 6

Only one of the organisms benefits (+/0).

Question 7

Parasitism

Answer 7

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

Question 8

Red Queen Hypothesis

Answer 8

The red queen hypothesis states 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 the species in these relationships must adapt to avoid extinction.