How to Revise Modern Genetics — Pearson A-Level Biology
Describe the process of transcription and translation. Explain the genetic code
Examiner Tips for Modern Genetics
- Draw diagrams to illustrate the processes.
- Memorise the key enzymes and their functions.
- Practice using codon tables to determine amino acid sequences.
- Use diagrams to illustrate the steps of genetic engineering.
- Link applications to specific techniques (e.g., PCR, gel electrophoresis).
- Be aware of current controversies and regulations.
Common Mistakes in Modern Genetics
- Confusing transcription and translation locations.
- Thinking the genetic code is overlapping.
- Mixing up codons and anticodons.
- Confusing gene editing with traditional genetic modification.
- Omitting the importance of regulatory sequences in gene expression.
- Overstating the precision of current techniques.
Key Marking Points
- Describes transcription: RNA polymerase, promoter, elongation, termination.
- Describes translation: ribosome, tRNA, codons, anticodons, peptide bond formation.
- Explains the genetic code: triplet, degenerate, non-overlapping.
- Distinguishes between mRNA, tRNA, and rRNA roles.
- Identifies the start and stop codons.
- Describes key steps in genetic engineering (e.g., isolation, insertion, expression).