Frameshift Mutations
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A frameshift mutation inserts or deletes a number of nucleotides not divisible by three, shifting the reading frame for every downstream codon.
Show
A single nucleotide deletion near a gene's start scrambles every following codon, usually producing a nonfunctional protein.
Watch for
An insertion or deletion of exactly three nucleotides adds or removes one codon without shifting frame — only non-multiples of three cause frameshift.