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How do find the recombination frequency of two genes

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How do  find the recombination frequency of two genes: take for instance a cross between two flies, one with mutant short antennae (s) and mutant big feet (b) and one with wild type long antennae (s+) and wild type small feet ( b+). You get the following progeny:

9 short antennae, small feet
11 big feet, long antennae
37 short antennae, big feet
43 long antennae, small feet

Reference no: EM13705209

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