Question

a strand of dna reads taaccgttg. below are mutated strands of this dna. which of the following is a substitution? a taacccttg b taccgttg c ttaaccgttgg

Explanation:

A substitution mutation is where one nucleotide is replaced by another. In option A, the 'G' in the original strand (TAACCGTTG) is replaced by a 'C' in the mutated strand (TAACCCTTG). Option B has a deletion of nucleotides, and option C has an insertion of nucleotides.

Answer:

A. TAACCCTTG