Notes 11-13-09 Part 3

Point mutations-mutation that changes only one base
mutation-any change in the dna sequence of an organism not a change in gene expression
missense-changes to dna sequence that cause changes to the amino acid sequence of protein
nonsense-changes to dna so there is now an early stop codon in the mrna
silent-chane in dna sequence but results in no change in the amino acid sequence