Biology 2581B Lecture Notes - Lecture 3: Alphaproteobacteria, Organelle, Chromosome
9 Feb 2017
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The bacterium that entered the eukaryotic domain cam from a lineage of alpha-proteobacteria. Both are alive, have a genome and have dna. Note: feeding is a complex behaviour and cannot be performed by most known bacteria. Normally b gets broken down inside, but lets say it wasn"t digested. B starts providing a benefit to a or vice versa. Overtime a and b develop a relationship. Over time the relationship gets stronger, start sharing a product. Both are distinct organisms is forced to live in a. Endosymbiotic gene loss some gene inside b allows it to live outside, but if a random mutation knocks out that gene then b. This type of genetic change increases complexity of the system and its really hard to go back. (cid:498)evolutionary ratchet(cid:499) Endosymbiotic gene transfer b starts to move some genes to the genome of a. Host a starts losing some genes because of their redundancy. B organism loses genes because of decreasing responsibility.
