Females heterozygous for three genes abcabc in this order, Ask an Expert

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Females heterozygous for three genes, ABC/abc (in this order) are testcrossed to males carrying only recessive alleles (abc/abc). In a cross producing 1000 progeny, how many double crossover progeny (AbC/abc and aBc/abc) will be observed if the map distance between A and B is 20 cM, the map distance between B and C is 5 cM and value of interference is 0.6?

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