Which of the following leads to point mutation?
(1) Insertion
(2) Deletion
(3) Substitution
(4) All of these
[PLEASE ANSWER WITH REFERNCE TO NCERT BIOLOGY XII]
Dear student,
Please find below the answer:
Mutations arising due to change in single base pair of DNA as in sickle cell anaemia are called point mutations. There is a substitution of gene in these type of mutations. For example: purine(adenine) is replaced by another purine (guanine) or purine is replaced by a pyrimidine.
Point mutations do not disturb the reading frame unlike frameshift mutations (insertion and deletion observed). They just cause a single codon change. Hence, option (3) is correct.
Hope this helps.
Regards.
Please find below the answer:
Mutations arising due to change in single base pair of DNA as in sickle cell anaemia are called point mutations. There is a substitution of gene in these type of mutations. For example: purine(adenine) is replaced by another purine (guanine) or purine is replaced by a pyrimidine.
Point mutations do not disturb the reading frame unlike frameshift mutations (insertion and deletion observed). They just cause a single codon change. Hence, option (3) is correct.
Hope this helps.
Regards.