The recessive alleles crossveinless (cv) and white (w) are on the Drosophila melanogaster X chromosome. The phenotype of Xcv+w+Y fly is wild type; the phenotype of Xcv-w+Y fly is crossveinless; and the phenotype of Xcv+w-Y fly is white eyed. You want to determine the distance of cv and w, so you set up a cross between a Xcv-w+Xcv+w- female and a wild type male. The male offspring of this cross fall into four groups based on their phenotype: there are 32 wild type males, 28 white eyed and crossveinless males, 275 crossveinless males, and 265 white eyed males. What is the relative distance of the crossveinless and white eye alleles on the X chromosome in Drosophila melanogaster?

MCQs on various topics in genetics, focusing on DNA, genes, and chromosomes. Topics include: crosses, mitosis and meiosis, protein synthesis, linkage, chromosome mapping, anomalies and disorders, and genetics technology and tools.