A DNA segment has base order CCC ATA GCT. Which copy exhibits a deletion in the first codon triplet and then a substitution mutation?(1 point) Responses CCA ATA GCT CCA ATA GCT CCA TAG CT CCA TAG CT CCA TAA CT CCA TAA CT CCC TAG CT

Answer 1

To analyze the given DNA segment "CCC ATA GCT," we need to break it down into codons (triplet bases). The first codon is "CCC."

1. Deletion in the first codon triplet: If we delete the first codon ("CCC"), we are left with "ATA GCT."

2. Substitution mutation: Now, we will substitute the first remaining base (A) of "ATA" for another base. The possible substitutions for A can be:

   • C: CTC
   • G: GTC
   • T: TTA

Based on this, let's examine the choices for the mutated DNA sequence:

• CCA ATA GCT: This indicates the deletion of one C and not a complete codon deletion.
• CCA TAG CT: This indicates deleting part of the codon and not changing the second codon.
• CCA TAA CT: This indicates changing the second ask with a deletion.
• CCC TAG CT: This indicates changing A in third codon with C.
• Other combinations (like "CCC" being unchanged) don't apply.

Considering this analysis, the copy that best matches a deletion in the first codon triplet followed by a substitution mutation is: "CCA TAG CT"

This indicates deletion of the first "C" and substitution of remaining bases.