A Drosophila researcher has recently isolated a number of mutant fruit flies. The phenotype of each mutant is described below (i–iv). For each mutant, describe the type of gene (maternal-effect gene, gap gene, segment-polarity gene, or homeotic gene) that was most likely the cause of the altered phenotype. Briefly explain your answer

(i) Homozygous mutant females appear phenotypically normal but produce larvae that have two posterior ends.
(ii) The flies contain four wings rather than two.
(iii) The wings are oriented backward.
(iv) The flies are missing two pairs of legs due to a shortened thoracic region