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Let's call the gene "C." Capital C means no cystic fibrosis; lower c means cystic fibrosis, since it is a recessive gene. CC is a person who does not have cystic fibrosis and also is not a carrier. Cc indicated a carrier. cc shows a person with cystic fibrosis. In order for a child to have cystic fibrosis, its parents must be:

1. cc and cc (both have cystic fibrosis, so every child will as well.)

2. Cc and Cc (both carriers; 25% chance of having a child with cystic fibrosis)

3. Cc and cc (one parent is a carrier and one has cystic fibrosis; there is a 50% chance that the children will have cystic fibrosis.)

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Q: What is the genotype of an individual that is not affected with cystic fibrosis?
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Related questions

What would be the genotype of a person with cystic fibrosis?

The genotype of a person with CF is cc. The genotype of a carrier of a CF mutation is Cc.


An individual heterozygous for cystic fibrosis?

Is a carrier of cystic fibrosis


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What is the probability of a child having cystic fibrosis if one of her parents was homozygous dominant and the other was a carrier for cystic fibrosis?

Assuming that each parent is a carrier for cystic fibrosis (has the genotype Ff), the probability that their second child will develop cystic fibrosis is one fourth. The probability doesn't change with the number of children they have. For each pregnancy, the chance that the child will have cystic fibrosis (have the genotype ff) is exactly the same.


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