Question

calhoun, miya ghs bio 3.2.3.3 a mutation occurs in one of the sections of a dna segment. it causes the normal segment atgccugaa to read as atgcugaa. which type of mutation occurred in the dna segment? substitution translocation deletion nondisjunction

Explanation:

• Substitution: Replaces one nucleotide with another. Here, in the normal segment \(ATGCCUGAA\) and the mutated \(ATGCUGAA\), the \(C\) (third - letter in the normal sequence) is removed (not substituted).
• Translocation: Involves the rearrangement of parts between non - homologous chromosomes. This is not the case here as we are dealing with a change within a single DNA segment.
• Deletion: Removes one or more nucleotides. In the given example, the normal segment \(ATGCCUGAA\) (length of 9 letters if we consider each letter as a unit representing a nucleotide - like structure for simplicity) and the mutated \(ATGCUGAA\) (length of 8 letters). The second \(C\) in \(ATGCCUGAA\) is deleted.
• Nondisjunction: Occurs during cell division when chromosomes fail to separate properly. This is not relevant to the change in the DNA sequence at the nucleotide level shown here.

Answer:

deletion