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This supports the idea that in embryos from wild-type mothers, dpp H~- mutations cause the transformation of dorsal into ven-tral epidermis. If tissue determined to become dorsal epidermis dies in the dpp rim-null embryos, then one should not see ventral or lateral tissue formed in the double-mutant combination.
Hybrid dysgenesis is caused by the mobilization of Drosophila. melanogaster P elements. P elements move at a high frequency in the germlines of the progeny. of certain crosses causing new mutations and sterility. Crosses. between different Drosophila melanogaster strains from different parts. of the world produce normal, fertile progeny.