01-08-2009, 12:59 AM
CF is a recessive genetic disease. This means, your sister and the baby's father both must be carriers of the disease. Your sister obviously is a carrier, because she has it, and the father of her child may or may not have the gene for CF. If he doesn't, then the baby will be fine.Also, since your sister has CF, you could have it too. Though, there's only a 25% chance you have it.
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