BIOL 371 Lecture Notes - Lecture 9: Mobile Genetic Elements, Archaea, Myxobacteria
Document Summary
Biol 371 - lecture 9 microbial evolution and systematics cont. Many basic principles of evolution are conserved across all domains of life. Evolution: change in allele (gene variants) frequency over time: novel alleles arise due to mutation and recombination, changes in allele frequency occurs through processes such as genetic drift and selection. Mutations: random changes in dna sequence that accumulate over time. Recombination: a process by which segments of. Dna are broken and rejoined to generate new combinations of genetic material. Genetic drift: a random process that can result in allele frequencies changing over time, in the absence of selection. Some members of a population will have a higher reproductive success than others just by chance. Most powerful in small populations small populations and in populations that experience frequent bottleneck events. Pic: 4 cells at random are then transferred ot each of 3 new tubes and the cells allowed to grow to fill each tube.