Question

Many parasites have evolved to be….A….in such a way that both host and the parasite tend to….B….that is, if the host evolves special mechanisms for rejecting or resisting the parasite, the parasite has to evolve mechanisms to….C….and neutralize them, in order to be successful with the same host species.
Choose the correct option for A, B and C:

• A. A-host-specific, B-evolve, C-counteract
• B. A-host-specific, B-coevolve, C-counteract
• C. A-source -specific, B-coevolve, C-counteract
• D. A-source -specific, B-evolve, C-counteract
  

Answer 1

The correct option is B A-host-specific, B-coevolve, C-counteract

A-Host specific, B-Coevolve, C-Counteract.

Host–parasite co-evolution is a special case of co-evolution. it is defined as the reciprocal adaptive genetic change of two antagonists (e.g. different species or genes) through reciprocal selective pressures. Hosts and parasites exert reciprocal selective pressures on each other, which may lead to rapid reciprocal adaptation. In the particular case of host–parasite coevolution the antagonists are different species of host and parasite.
If the host evolves a special mechanism for rejecting or resisting the parasite, then the parasite has to (simultaneously) evolve i..e, co-evolve the mechanism to counteract and neutralise them.