Biology

Jessie Graham

18 September, 04:06

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