What result from successive mutations of the same gene

The correct answer is multiple alleles.

Explanation:

Polyalelia or multiple alleles is the condition where a genotype demonstrates more than three alleles, not just two, for the similar gene address or chromosomal locus, predicting a phenotype, that is, a characteristic. The multiple alleles are the outcome of consecutive mutations in the genes of a specific locus.

Here, a single mutation has resulted in a new protein with a new and ... how successive mutations turned a pair of protoHox genes in the simple ... The same thing can happen in fruit flies, and likely in many other groups too.