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  4. Mutation in which thymine is replaced by cytosine is called

Q. Mutation in which thymine is replaced by cytosine is called

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Solution:

: The replacement of one base by another is called substitution. It may be - transversion which is the replacement of purine by pyrimidine or pyrimidine by purine and transition which is the replacement of purine by a different purine or pyrimidine by a different pyrimidine. Thymine and cytosine are pyrimidine bases.