A chemical mutagen alters the pairing property of Adenine base in such a way that it pairs with cytosine base during the process of replication. What would be the code sequence in mRNA by a DNA sequence with altered base for the original DNA having sequence CAGGAC?

GUC CUG

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CUC CUC

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GCC CCG

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CCG GCC

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Solution

The correct option is C
GCC CCG
Only a single codon in the gene sequence is changed in base substitution mutation.

Due to mutation guanine base replace adenine and pair with cytosine during replication. This mutation is also known as point mutation.

Original DNA sequence - CAGGAC

Altered DNA sequence - CGGGGC

mRNA sequence - GCCCCG

So, the correct answer is- GCCCCG

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