A geneticist is using a three-point testcross to map three linked Drosophila recessive mutations called a, b, and c, where a is associated with anomalous gait, b is associated with buckled wings, and c is associated with curved bristles. She first crosses homozygous anomalous, buckled flies to homozygous curved flies. Next, she testcrosses the F₁ progeny to anomalous, buckle curved flies. She obtains 1000 progeny distributed as shown. From this data, calculate the map distance between b and c. Testcross progeny phenotype curved anomalous, buckled wild type anamalous, buckled, curved buckled, curved anomalous anomalous, curved buckled Number 277 283 4 6 133 127 83 87 map distance: m.

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