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19 January, 13:20

A mutation that inserts or deletes one or two nucleotides is usually more harmful than a mutation that substitutes one base for another because -

A It changes one amino acid in the sequence of a protein

B it shifts the reading frame for the rest of the code causing many errors

C The codon consists of three nucleotides coding for an amino acid

D the chromosomes fail to separate resulting in trisomy 21

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  1. 19 January, 13:41
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    The answer you're looking for is B.
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