The loci for black body (b) and for curved wings (cu) are separated by 13 map units on chromosome- 2. the locus for purple eyes (pu) is 19 map units from curved wings, and the order of loci is black, curved, and purple. a female drosophila that is homozygous for black and purple is crossed with a curved male an f1 female from this cross is test-crossed. at what frequency are phenotypically curved, purple but not black progeny expected? (assume coc =1)"