Homozygous females or females transheterozygous for mxcG9 and mxcM1, mxcG46, mxcG43, mxcSO, mxc1 or mxc16a-1 have fewer egg chambers than wild-type flies, but are fully fertile and fecund. mxcG9/mxc22a-6, mxcG9/mxcG48 or mxcG9/Df(1)10-70d females lay many small eggs with a thin chorion and small dorsal appendages that collapse after oviposition.
Fertility over Df(1)10-70d is reduced.
The alleles of mxc form a series. From weakest phenotype to strongest phenotype: mxcG9 < mxcM1 < mxcG46 < mxcG43 < mxcSO < mxc1 < mxcG48.