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Existic fibrosis is inherited as a recessive. That is to say you've got to have two copies of the CF gene in order to have the disease. So the question I asked is for this marriage to powdered zygotes, 12 appearances normal, they marry, what is the chance that a normal child of this marriage will be a carrier? Now, I can think of five or six places on the internet that have an answer, and it's the wrong one. The actual answer is that two-thirds of the normal children of this marriage will have a copy of the cystic fibrosis allele. The reason for that is that...