Which developmental changes would have have been caused by genes other than Hox genes?

Question

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If a Hox gene malfunctions in fruit flies,the result can be more than one pair of wings.Mutations in two adjacent Hox genes in the mouse result in shortened forelimbs that are missing the radius and ulna bones.In humans,mutations in a different Hox gene cause synpolydactyly,a rare condition characterized by extra digits (fingers and toes),some of which are fused to their neighbors.

Which Developmental Changes Would Have Have Been Caused by Genes