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I have a Female Rhadinocentrus rainbow that I was breeding with ( not at present though ) This female throws about 5 in 100 red tailed females ( very unusual ) she also throws 1/2 of the females ( almost exactly ) with a congenital defect in the caudal fin but otherwise healthy fish ( feeders , I am sad to say ) All of her male Fry are normal ( 50% half Red 50% red tail ) The male fry from her are the best coloured ones I have . Is there anyway of knowing if the male offspring from her will carry the congenital defect as a recessive gene . Or is the defect solely in the X Chromosome . I only went to year 12 ( no uni ) so a little over my head . I would like to breed the Half red males back with the red tailed females to produce a population with half red males and red tail females but without congenital defects . Just a note - I am also breeding a colony that is just a random selection of multiple colour morphs ( pretty much just like in the swamp )