Which type of mutation involves changing one nucleotide in the DNA sequence?

Which type of mutation involves changing one nucleotide in the DNA sequence?

• A. Point mutation
• B. Frameshift mutation
• C. Deletion mutation
• D. Insertion mutation

Answer: (A)

A point mutation is characterized by the alteration of a single nucleotide in the DNA sequence. This type of mutation can occur in several ways, such as a substitution where one base is replaced with another. Despite being a small change, point mutations can have significant effects on the resulting protein, potentially leading to changes in amino acids or even creating stop codons that terminate protein synthesis prematurely. In contrast, frameshift mutations, deletions, and insertions involve more extensive changes to the DNA sequence. Frameshift mutations occur when nucleotides are added or removed from the DNA in numbers that are not multiples of three, altering the reading frame of the genetic code. Deletions involve the loss of one or more nucleotides, while insertions refer to the addition of nucleotides into the sequence. Both of these types of mutations can disrupt the normal reading frame and potentially have more severe consequences than point mutations. Hence, point mutation stands out as the type specifically focused on the alteration of a single nucleotide.

A point mutation is characterized by the alteration of a single nucleotide in the DNA sequence. This type of mutation can occur in several ways, such as a substitution where one base is replaced with another. Despite being a small change, point mutations can have significant effects on the resulting protein, potentially leading to changes in amino acids or even creating stop codons that terminate protein synthesis prematurely.

In contrast, frameshift mutations, deletions, and insertions involve more extensive changes to the DNA sequence. Frameshift mutations occur when nucleotides are added or removed from the DNA in numbers that are not multiples of three, altering the reading frame of the genetic code. Deletions involve the loss of one or more nucleotides, while insertions refer to the addition of nucleotides into the sequence. Both of these types of mutations can disrupt the normal reading frame and potentially have more severe consequences than point mutations. Hence, point mutation stands out as the type specifically focused on the alteration of a single nucleotide.