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tweedleasasin tweedleasasin
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Explain the distinction between primary and secondary endosymbiosis.
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Genetic Analysis: An Integrated Approach


Edition: 3rd
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hardyusufhardyusuf
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Primary endosymbiosis is when descendants of a free-living species without endosymbionts evolves into the endosymbiont of another species.  Secondary endosymbiosis is where a free-living species with its own endosymbiont(s) is enveloped by a second host species.  After a period of gene transfer, the endosymbionts from the once free-living species become the endosymbionts of the second host, resulting in the transfer of endosymbiont genomes (mitochondria or chloroplasts) across phylogenetically-distinct host taxa.

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