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This picture shows that 25% of their children would have cystic fibrosis, 50% would be carriers of the disease and 25% wouldn't be completely cystic fibrosis free. To avoid cystic fibrosis being passed on, onlyone parent should be a carrier so that there isnochance of any childin their offspring having the disorder, but if both do then there will be a 25% chance of a child having it.