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MODEL PAPER 2 — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMODEL PAPER 23 Marks
Question
i. How does mutation occur?
ii. Differentiate between point mutation and frameshift mutation.
✓

Answer

a. Loss(deletion) or gain (insertion / duplication /addition) or change in position of DNA segments / chromosome cause the mutation.
b. Mutation due to change in a single base pair of DNA is point mutation, while insertion or deletion of one or two bases changes the reading frame from the point of insertion or deletion is frameshift mutation.

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