Aspects of this topic are discussed in the following places at Britannica.
In some interactions between parasites and hosts, coevolution can take a specific form called gene-for-gene coevolution or matching-gene coevolution. It is a form of reciprocal evolutionary change based on the idea that, if one member of a coevolving relationship has a gene that affects the relationship, the other member has a gene to counter this effect. These genes evolve reciprocally and...
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