The type of mutation you are describing, where the normal allele has more base pairs than the mutated form, is likely a deletion mutation. In a deletion mutation, one or more base pairs are removed from the DNA sequence, resulting in a shorter allele compared to the normal version. This can affect the gene's function, potentially leading to various phenotypic effects depending on the role of the affected gene.
a normal allele for a gene has more base pairs than the mutated form of the allele. Which type of mutation occurred.
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