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Effect of point mutation on protein synthesis

Assume that protein synthesis always reads along a chromosome three bases at a time to code for each successive amino acid in a protein. There are two kinds of point mutations, a base substitution, and a base deletion. How are these two types of mutations likely to affect the protein coded for by a mutant gene?

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Base substitutions involve the replacement of one base (and its complementary partner) by one of the other bases (and its complementary partner). Base substitutions affect only the amino acid coded for by the codon affected.

A base substitution does not ...