The fruit fly cross shown here analyzes the transmission of two genes on the x chromosome. the male parent has mutant alleles for both the white gene (w-) and the crossveinless gene ( the female parent has nonmutant forms of these genes (w+ and cw+). a cross between siblings of the f1 generation—a red-eyed, crossveined female and a red-eyed, crossveined male—generates f2 progeny. examine the genotype of the f2 male progeny. notice that the progeny fall into two groups. refer to the figure below when answering the following question: the group that represents a small proportion of the progeny, deriving from maternal gametes containing combinations of alleles not found in either x chromosome of the mother, is called the .