BIOL 123 Lecture Notes - Lecture 26: Rna Virus, Coevolution, Leafhopper
Document Summary
Examples on how organisms co-evolve because actions cause each one to adapt to one another"s defense mechanisms. Mass extinctions: co-evolution makes species vulnerable, if one goes extinct the other will die off, has shown that they have survived because they have different levels of reproduction. Diversifying co-evolution: refers to an increase in genetic diversity caused by the heterogeneity of co-evolutionary processes across the range of ecological partners. Aster bacteria feeds on crops and can inject bacteria to sicken plants = can wipe out crops: marvels of co-evolution, survive off of two species of bacteria that live inside bacteriomes (inside of leafhopper) Endosymbionts: mutualistic organisms that live within the body or cells of another organism. Each species lost vast majority of its genome. Depend on host for nutrients yet still retain gene for synthesizing amino acids. New bacteria have replaced original ones = new endosymbionts co-speciated with needed to survive hosts and lost most of their genes.
