Three genes b, vg, and bw are on the same chromosome in fruit flies. The mutant and recessive traits related to three genes are black body color (b-), vestigial wings (vg-), and brown eyes(bw-). The related wild-type traits are dominant. A cross was made between wild-type males and females expressing the black body color, vestigial wings, and brown 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 F2 females were collected and phenotypes, and the data are shown below. What is the recombination frequency between b and vg?

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