The recessive alleles for yellow body (yb) and cut wings (cw) identify two autosomal genes on the second chromosome of drosophila melanogaster. when females, heterozygous at these two genes (yb+yb cw+cw), were crossed with yellow-bodied, cut-winged males, the following classes and numbers of progeny (out of 1000) were obtained:
a. wild type body color, wild type wings 120
b. wild type body color, cut wings 360
c. yellow body color, cut wings 140
d. yellow body color, wild type wings 380