Obligately symbiotic relationships generally do not foster horizontal gene transfer at a higher rate than non-symbiotic relationships.

Question

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Obligately symbiotic relationships often involve coevolution of the involved organisms, which can lead to higher rates of horizontal gene transfer. This is especially true for endosymbiotic relationships where one organism lives inside the other. In these cases, there can be extensive gene transfer between the host and endosymbiont genomes.

Obligately Symbiotic Relationships Generally Do Not Foster Horizontal Gene Transfer