Biology
Grade-8
Easy
Question
How many kinds of mutations are found in DNA which includes mutation of only one base?
- 1
- 2
- 3
- 4
Hint:
Point mutations and base substitution are the two types of mutation.
The correct answer is: 2
There are two three of DNA Mutations: base substitutions, deletions, and insertions.
1. Base Substitution
Single base substitutions are called point mutations, recall the point mutation Glu -----> Val which causes sickle-cell disease. Point mutations are the most common type of mutation and there are two types.
Transition: this occurs when a purine is substituted with another purine or when pyrimidine is substituted with another pyrimidine.
Transversion: when a purine is substituted for a pyrimidine or a pyrimidine replaces a purine.
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