FB2026_03 , released September 17, 2026
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Cook, K.R. (2026.6.23). Origin of FM7k balancer. 
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FBrf0265698
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Personal communication to FlyBase
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Loring Craymer is listed as the discoverer of FM7k. I’m guessing that Loring made FM7k by recombination between FM7a and a In(1)dl-49 chromosome to remove wa and swap in snX2 (without swapping in g4 and vof, which are on FM7c). There have been In(1)dl-49 chromosomes with lots of different markers, so it seems reasonable to think Loring swapped several sets of markers into FM7 by double crossover.
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    English
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    Aberrations (1)
    Balancers (2)