Question

What is the consequence of a transition mutation in double-stranded DNA?

		A purine is replaced by another purine, or a pyrimidine is replaced by another pyrimidine.
		A base pair is lost within the DNA of a gene, which causes a reading frameshift.
		The parent, but not its offspring, will be affected by the mutation.
		A base pair is added to the DNA within a gene, which causes a reading frameshift.
		A purine is replaced by a pyrimidine, or a pyrimidine is replaced by a purine.

Answer 1

The answer is 1st option - A purine is replaced by another purine, or a pyrimidine is replaced by another pyrimidine.

In transition mutation, the base of a single nucleotide of DNA is replaced with another base. In transition mutation, one base in the DNA is replaced with another base of the same class. Transition mutation is a point mutation that occurs when a purine base is replaced with another purine base or a pyrimidine base is replaced with another pyrimidine base. The four nitrogenous bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C). The four nitrogenous bases are divided into purines and pyrimidines. Adenine (A) and guanine (G) are the two purines and the cytosine (C) and thymine (T) are the two pyrimidines. Transition mutation involves a single base substitution. Transition mutation is the most common point mutation. Transition mutation mostly occurs due to the error in DNA replication. An example of transition mutation is the substitution of a purine base adenine (A) with another purine base guanine (G) or substitution of a pyrimidine base Cytosine (C) with another pyrimidine base thymine (T)