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A cross in Drosophila involved X-linked genes s, sc, and v. The mutant and recessive traits related to three genes are scute bristles (sc-), sable body (s-), and vermilion eyes (v-). The related wild-type traits are dominant. A cross was made between wild-type males and females expressing the scute bristles, sable body, and vermilion eyes. All the F1 females were wild-type.Then a cross is made between F1 females and males with all three mutant traits. In total, 1000 F2females were collected and phenotypes, and the data are shown below. What is the recombination frequency between sc and v?
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