How a single base change can rewrite the blueprint of life
In short: This video explains how mutations occur within DNA and why most changes to our genetic code don't actually affect our bodies. It breaks down the mechanics of amino acid sequences and the distinction between coding and non-coding regions.
DNA functions as a set of instructions where genes are organized into codons—sequences of three bases that code for specific amino acids. A mutation occurs when a base in this sequence changes, which can potentially alter the resulting amino acid sequence and, consequently, the structure and function of the protein produced.
Not all mutations are impactful. The video distinguishes between mutations in coding DNA, which can change protein function, and non-coding DNA, which plays a vital role in gene expression but may not alter the protein itself. It also covers specific types of gene mutations, including substitutions, insertions, and deletions.
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Sources
- Summary by Intellect · source: GCSE Biology - What are DNA Mutations? (2026/27 exams)
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