BIOL 2P05 Lecture Notes - Lecture 10: Horizontal Gene Transfer, Symbiosis, Genome Evolution
28 Mar 2016
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At least one of the organisms benefits from the relationship. Parasitism: one organism benefits, one organism is harmed. Commensalism: one organism benefits, one organism is unaffected. Thousands of species on our skin; bacteria, fungi, worms. Face mites = microscopic arthropods living around body, a lot on face: life cycle = 14 days; females, live 5 days as adults, don"t have an anus, they evolve very rapidly. Mites from different populations around the world = map history of mites. Can use their relation to each other to determine how humans have moved throughout time. This is symbiosis: is it obligate symbiosis, or not, obligate; they have to live on your face, you are born without them. Different people have different strains of mites. Can determine ancestry by the types of mites that you had from close contact. Genome evolution is strongly affected by this. What kind of symbiosis do face mites exhibit: commensalism!
