If anyone knows, that would be great thanks.
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A point mutation is also referred to as a single nucleotide substitution. It mean say you have the codon TAT, which codes for Tyr. A point mutation might change the T to a C, so now you have TAC. In this case, it is a silent mutation because TAC and TAT both encode for the amino acid Tyr. However, it may be fatal if the T is replaced with a G, making the codon sequence TAG, which encodes for a stop codon. This is known as a nonsense mutation. Let's say the A changes to C, so now you have TCT. This encodes for the amino acid Ser. I can't remember what this type of mutation is called, but it is significant if the amino acid it changes to differs in polarity or charge etc., but usually is not fatal.