Question

genetic variation from errors quick check
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
cca ata gct
ccc tag ct
cca taa ct
cca tag ct

Explanation:

• Deletion in first codon triplet: The original first codon is CCC. A deletion would mean one base is removed. So it becomes CCA (one C is deleted from CCC).
• Substitution mutation: After the deletion in the first codon, we look at the other codons. In the original, the second codon is ATA. A substitution means one base is replaced. In CCA TAG CT:
• The first codon CCA (deletion from CCC).
• The second codon TAG: ATA has A replaced by G (substitution). Also, the third codon CT (from GCT, deletion of G).

Answer:

CCA TAG CT