BIOL 112 Lecture Notes - Lecture 9: Repressor, Point Mutation, Regulation A
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BIOL 112 Full Course Notes
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A gene is read from promoter to a terminator. A gene is read (by rna polymerase) from the promoter and moves downstream to the terminator. The promoter can be found upstream of the terminator. The terminator can be found downstream of the promoter. A second gene may be found upstream of this promoter or downstream of this terminator. Given promoter and terminator position/directionality, can determine if upstream/downstream. Polymerase move away from each other = divergent. Dna incorrectly copied during replication (cell division) Other mutagens changes in the cellular environment (chemicals, toxic radicals etc. ) A mutation in the genotype may or may not affect the phenotype. Point mutation is a mutation in a single nucleotide. Single nucleotide substitution results in different codon but does not result in change in amino acid. Wobble effect, multiple codons code for same protein. Single nucleotide substitution results in different codon that changes amino acid or results in a stop codon.
