Question

part 1: the following mutation is found in the somatic cell of an orangutan
original dna: atg-cgg-tta
mutated: atg-cgg-ttt
which codon (group of 3) has changed in the dna sequence?

the second codon
the first codon

the third codon

Explanation:

Step1: Identify codons

Original DNA codons: ATG (1st), CGG (2nd), TTA (3rd).
Mutated DNA codons: ATG (1st), CGG (2nd), TTT (3rd).

Step2: Compare codons

First codon (ATG) same. Second codon (CGG) same. Third codon changed from TTA to TTT.

Answer:

The third codon