2. In a drosophila family, there are three recessi...

2. In a drosophila family, there are three recessive mutant genes s, c and v located on X chromosome. When crossing the mutant female drosophila with wild type male, in F1 generation, all the female are wild type and all male are mutants. Using the male and female drosophila in F1 generation as parents, the results are as following: s c v 314 + + + 280 + c v 150 s + + 156 s + v 46 + c + 30 s c + 10 + + v 14 Question: (1) Please write out the genotype of two parents and F1. (2) Please decide the order of the three genes. (3) Please calculate the genetic distance among three genes, and draw the genetic map of this region. (4) What is the coefficient of coincidence？