Step 3: Compare the Parentals with the Double Cross Overs (DCO) to determine the correct order ofthe genes along the chromosome.A. List the alleles on the chromosome diagrams below.ParentalsDCOB. Which single gene allele pair in the double cross over if exchanged would make the double crossover chromosomes be exactly like the Parentals?C. Reorder the alleles on the Parental chromosomes so that the gene allele pair in part B is in themiddle. Check the order, by creating a double cross over of the Parental chromosomes. If allelescombination (not order) matches the DCO then you correctly determined which gene is in the middlefor the chromosome map.ParentalsStep 4: Rewrite all the gene orders in Step 2 in the space below with the correct gene in the middle. Introduction | FlyLab JS | AbbreviationsAnalyze Lab NotesCopyright © 2Virtual Coursessesore sex of fliesInclude a test of hypothesisResults for Cross #2PhenotypeObservedProportion4230.4226PR0.0060V.G500.0500BL290.0290P.R..VG170.0170PR.BL590.0589VG. BL0.0030PR..VG. BL4140.4136Total10011.0000ning Exdocx

As per our guidelines policy, We are supposed to answer first three sub parts of a question. Please repost remaining parts in separate post. The data represents three point test cross. Because three genes PR, VG and BL are involved.The greater number in the F2 depicts the parental combination in the offspring. The lowest numbers are double cross over in the progenies. Please look in the image for parental and double cross over combination: A)B). The PR gene is swapped between the parental chromosomes. This wil give rise to produce double cross over combinations. That's why middle gene is PR. The PR and + (wild form of PR) pair of alleles exchange between parental to produce double cross overs. C) The order of genes are VG PR BL. That's why the parental combination becomes;