Biology A-Level
downstream codons
What downstream codons means in Biology A-Level, as defined for AQA.
Definition of downstream codons
Check what you remember
Read the wording for your board, then hide it and explain downstream codons in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
Every codon after the mutation is regrouped from different bases and specifies a completely different sequence of amino acids.
Topics that use downstream codons
- Alteration of the sequence of bases in DNA can alter the (AQA A-Level)
Related terms
- amino acid sequence
- base analogues
- codons and anticodons
- DNA replication errors
- frameshift
- premature stop codon
- R group interactions
- substitution
Using downstream codons in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge