In Drosophila, the genes y, f, and v are all X-linked. Females who are homozygous for recessive alleles of all three genes (y f v / y f v) are crossed to wild-type males (y+ f+ v+ /y+ f+ v+ ). The resulting trihybrid F1 females are test-crossed.The F2 are distributed as follows:y f v - 3210y f v+ - 72y f+ v - 1024y f+ v+ - 678y+ f v - 690y+ f v+ - 1044y+ f+ v - 60y+ f+ v+ - 3222Total10,000Which of the following linkage maps correctly shows the order of the y, f, and v genes?

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