Reductive evolution

The bacteria will adapt to survive and thrive in the restrictive state by altering and reducing its genome to get rid of the newly redundant pathways that are provided by the host.

[2] Endosymbiont or parasitic microorganisms such as Rickettsia prowazekii, Chlorella in Paramecium, Buchnera aphidicola in aphids, and Wolbachia bacteria in Wuchereria bancrofti have all been studied and fully sequenced which is why they are used as examples of reductive evolution.

The absorbed organisms undergo reductive evolution, deleting genes that were deemed nonessential or non-beneficial to the cell in its specific niche in the host.

[8] Chlorella is a secondary endosymbiont that lives within Paramecium species and is an example of obligate intracellular reductive evolution.

Following reductive evolution, it is suggested that between 180 and 425 million years ago the Rickettsia parasite incident occurred.

Through the process of reductive evolution large sections of the DNA could have been removed, turned off, or phased out by the organism if found to be no longer useful in its desire to survive and grow.