The wild-type allele for a gene has more base pairs than the mutated form of the allele. Which type of mutation occurred? base pair insertion base pair deletion base pair separation base pair substitution

base pair deletion

Explanation:

The type of mutation that occurred would be base pair deletion.

Base pair deletion mutation is a type of mutation involving the deletion of one or more nucleotide bases from a DNA/gene. This causes a reduction in the base pairs and shortens the length of the DNA/gene

For example, if the first codon of a gene with base sequence 'AGGGCTACG' is deleted, the gene becomes shortened with a new base sequence of 'GCTACG'. Thus, the mutated gene would have a shorter base pair when compared to its wild-type counterpart.