A fully planned 60 minute lesson on the first learning objectives of topic 4.
Covers the following spec points:
• A gene is a base sequence of DNA that codes for:
○ the amino acid sequence of a polypeptide
○ a functional RNA (including ribosomal RNA and tRNAs).
• A gene occupies a fixed position, called a locus, on a particular DNA molecule.
• A sequence of three DNA bases, called a triplet, codes for a specific amino acid.
• The genetic code is universal, non-overlapping and degenerate.
• In eukaryotes, much of the nuclear DNA does not code for polypeptides. There are, for example, non-coding multiple repeats of base sequences between genes. Even within a gene only some sequences, called exons, code for amino acid sequences. Within the gene, these exons are separated by one or more non-coding sequences, called introns.
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