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A segment of DNA has base sequence GAC G...

A segment of DNA has base sequence GAC GAC CGC AAA ACA AGC. Due to deletion, the first base 'G' is deleted.The likely effect of this on the coding of DNA segment is that

A

first amino acid is different and all others will be like the earlier polypeptide

B

there will be no change in polypeptide chain

C

whole sequence of amino acids is changed

D

the polypeptide chain will be two short of amino acid.

Text Solution

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The correct Answer is:
To solve the question regarding the effect of the deletion of the first base 'G' from the DNA sequence GAC GAC CGC AAA ACA AGC, we will follow these steps: ### Step 1: Understand the Original Sequence The original DNA sequence is: - GAC GAC CGC AAA ACA AGC ### Step 2: Identify the Deletion The problem states that the first base 'G' is deleted. Therefore, the new sequence after deletion will be: - AC GAC CGC AAA ACA AGC ### Step 3: Group the Bases into Codons DNA is read in triplets (codons) during protein synthesis. We will group the bases into codons: - Original Sequence: GAC | GAC | CGC | AAA | ACA | AGC - New Sequence after Deletion: ACG | ACC | GCA | AAA | ACA | AGC ### Step 4: Analyze the Impact on Codons Now we will analyze the new codons formed after the deletion: - The original codons were: - GAC (codes for Aspartic acid) - GAC (codes for Aspartic acid) - CGC (codes for Arginine) - AAA (codes for Lysine) - ACA (codes for Threonine) - AGC (codes for Serine) - The new codons are: - ACG (codes for Threonine) - ACC (codes for Threonine) - GCA (codes for Alanine) - AAA (codes for Lysine) - ACA (codes for Threonine) - AGC (codes for Serine) ### Step 5: Conclusion on the Effect of Deletion From the analysis, we can conclude that: - The first codon has changed from GAC to ACG, which means the first amino acid is different. - The subsequent codons have also changed, leading to a different sequence of amino acids being produced. ### Final Answer The likely effect of the deletion of the first base 'G' is that the whole sequence of amino acids is changed. ---
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