The recessive аlleles fоr vermilliоn eye cоlor (v) аnd cross-veinless wings (c) identify two linked аutosomal genes in Drosophila melanogaster. When females, heterozygous for these genes (VvCc), were crossed with vermillion eyed, cross-veinless winged males (vvcc), the following classes and numbers of progeny (out of 1000) were obtained: wildtype eye color, wildtype wings 354 wildtype eye color, cross-veinless wings 142 vermillion eye color, cross-veinless wings 357 vermillion eye color, wildtype wings 147 Based upon these results, the map distance between the v and cv genes is estimated to be: