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Hi!
It would be insersion, because an unfamiliar letter was inserted in.
Hope this helps!
The type of mutation that causes a DNA sequence which reads ACGTTCATT before a mutation occurs to read ATCGTTCATT after mutation has occurred is an insertion
Mutation
A mutation is an abnormal change that occurs in a the nucleotide sequence of a DNA or RNA sequence which causes a change in the original sequence of nucleotides.
Types of Mutation
The types of mutation that occurs in nucleotides sequenses include:
- substitution
- insertion
- deletion
- point
In all these types of mutation, the mutation that causes the insertion of one or more extra nucleotides in the original sequence of nucleotides is known as insertion.
In the mutation give an T is inserted in the original sequence of nucleotides.
Therefore, the type of mutation that causes a DNA sequence which reads ACGTTCATT before a mutation occurs to read ATCGTTCATT after mutation has occurred is an insertion.
Learn more about mutations at : https://brainly.com/question/17031191