Question

1.
original dna: aac tgc gga tta
mutated dna: aac tgc ggt tta

• question: which type of mutation occurred here?
• answer options:
• a. deletion
• b. insertion
• c. substitution
• d. none

2.
original dna: cga taa ggc cta
mutated dna: cga taa gc cta

• question: what type of mutation is present in the mutated dna?
• answer options:
• a. deletion
• b. substitution
• c. insertion
• d. none

3.
original dna: ttg cga att gcg
mutated dna: ttg cga aat gcg

• question: identify the mutation that took place in the sequence.
• answer options:
• a. insertion
• b. deletion
• c. substitution
• d. none

4.
original dna: gat cgc tta gga
mutated dna: gac cgc tta gga

• question: which mutation is shown in this altered dna sequence?
• answer options:
• a. insertion
• b. substitution
• c. deletion
• d. none

Explanation:

Problem 1

Compare original (AAC TGC GGA TTA) and mutated (AAC TGC GGT TTA) DNA. The third codon changes from GGA to GGT, meaning one base (A→T) is replaced. This is a substitution.

Original DNA: CGA TAA GGC CTA; Mutated: CGA TAA GC CTA. The "G" in "GGC" is removed, so a base is deleted. This is a deletion mutation.

Original: TTG CGA ATT GCG; Mutated: TTG CGA AAT GCG. The third codon changes from ATT to AAT (T→A), so one base is substituted. This is a substitution.

Answer:

C. Substitution

Problem 2