Question

1. compare the two dna sequences and polypeptide chains they produce. what type of mutation has occurred to the bottom sequence? a. substitution b. insertion c. deletion d. no mutation

Explanation:

• Substitution mutation: A single nucleotide is replaced by another. In the given DNA sequences, we can observe that a single nucleotide change has occurred.
• Insertion mutation: Adds one or more nucleotide base pairs into a DNA sequence. This is not the case here as there is no addition of extra nucleotides.
• Deletion mutation: Removes one or more nucleotide base pairs. But there is no removal of nucleotides as per the sequences.
• No mutation: Clearly, there is a change in the DNA sequence, so this option is incorrect.

Answer:

A. Substitution