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Q.

What is the consequence of a frame shift mutation in a gene's DNA sequence?

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a

It changes a single base without affecting the reading frame.

b

It alters the reading frame, potentially changing every amino acid downstream. 

c

It results in the insertion of a stop codon at the mutation site.

d

It replaces only one amino acid with another in the protein sequence.

answer is C.

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Detailed Solution

Insertion or deletion of one or two bases changes the reading frame from the point of insertion or deletion.

The effect of point mutations that insert or delete a base in a structural gene is that it alters the reading frame, potentially changing every amino acid downstream. 

 

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