BIOL 2P05 Lecture Notes - Lecture 25: Linkage Disequilibrium, Multicellular Organism, Heterochrony
23 Mar 2018
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General practice questions: explain 3 modes by which bacteria can obtain dna, how and from who. Transformation - picked up free dna from the environment. Conjugation - bacterial sex (sharing dna with each other: give examples of how hgt can affect the phenotype. In some e. coli strains, pathogenicity is proportional to amount of hgt. Creates variation for natural selection to act on: what are 2 mechanisms by which viruses can compact their genome. Eliminate non-coding dna (all dna is useful unlike in humans) A ribozyme is an rna molecule that can act as an enzyme. Paul and joyce rna can catalyze reactions involved in its own assembly. To show evolutionary change, there had to be variation in rna sequences, the ability to reproduce or replicate themselves, and fitness differences between sequences. It illustrates that natural selection did not occur in rna world: explain the endosymbiotic theory on the origin of the eukaryotic cell.
