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If both parents are just carriers of the gene that causes CF then there is a 75% chance that the child will not have CF.

To break it down farther... 25% chance that they will have CF. 50% that they will be a carrier. 25% that they will have two normal genes.

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Q: What are is the percentages of a child not having cystic fibrosis with parents who both have the trait?
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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.


What are the chances of passing on the CF gene?

If the spouse he or she has the gene needed to pass on cystic fibrosis, then yes it will have children with cystic fibrosis. If the spouse does not have that gene then the child will not have cystic fbrosis but will be a gene carrier of cystic fibrosis.


What does heterozygous have to do with cystic fibrosis?

people who are heterozygous for cystic fibrosis are not directly affected by the disease (although there is some evidence they have more chance of getting Asama) however they do still carry the gene for CF (they are carriers) this means if they have kids with another carrier they have a 25% chance of having a CF positive child (out of four one non effected, two carriers, and one diseased)


How can a child with cystic fibrosis have two parents that do not have cystic fibrosis?

The parents will both have a specific gene defect. If they do there is then a 1 in 4 chance of them having a child with cf. so if you are considering having children you should have a blood test to find out if you are a carrier of the gene causing cf. hope that helps.


Is cysticfibrosis dominant or recessive?

cystic fibrosis is a genetic disorder which is reccesively inherited.A good way to remember this is to picture the disease as a disorder located on a dominant allele: every person with the gene would have the disease. Because of the severity of the disease, few of the people who suffered from it would reproduce, and it would be extremely rare. (Remember that there is no cure, and before newer techniques in medicine could prolong their lives, people with the disease only lived till approximately 5 years old).The way it is, people can be carriers of the gene without having the disease, and thus pass it on if both parents are carriers.

Related questions

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.


What are the chances of a normal person and a carrier for cystic fibrosis have a kid with cystic fibrosis?

Zero. Cystic fibrosis is an autosomal recessive disease. This means that both parents must carry a mutated gene and have a 1 in 4 (25%) chance of having a child with CF.


What would a genetic counselor tell parents who had cystic fibrosis or were carries of the cystic fibrosis about the chances of their children having cystic fibrosis?

If both parents are carriers then the child has a 25% chance of having cystic fibrosis. If one parent has CF and the other the other was just a carrier then the child has a 50% chance of having CF. If one parent has CF and the other has two normal genes then there is no chance of the child having CF. If one parent is a carrier and the other has two normal genes then there is no chance of the child having CF. If both parents have CF then there is a 100% chance that the child will also have CF.


What is the genotype of an individual that is not affected with cystic fibrosis?

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.)


What is the probability of two healthy people where one is a carrier being parents to a child born with cystic fibrosis?

If only one person is a carrier of cystic fibrosis than there is no chance of having a child with it. Both parents have to be carriers and even then there is only a 25% chance. If only one carries than there is a 50% chance that their children will carry but will not have cystic fibrosis.


Why do males with Cystic Fibrosis have a very small chance of having kids?

because 95% of men with cystic fibrosis are sterile


What is the inheritance pattern for the cystic fibrosis allele what is the reasoning for this conclusion?

If both parents have the gene, the chances are 25% of having a child with Cystic Fibrosis. The male and females x genes are affected by it and only half of it. So when the parents mate and they are going to have a baby, the chances are 25%


How can you get cystic fibrosis?

For a baby to be born with Cystic Fibrosis, both parents must be carriers of the faulty CF gene. Where both parents carry the faulty gene, each child has a one in four chance of having CF, a two in four chance of being a carrier and a one in four chance of not having any CF genes.


Can cystic fibrosis kill the person who has it?

Cystic fibrosis is a inherited disease where ususally by the time of 30-35 the person who has it does die.


Is cystic fibrosis a genetic dosorder?

Yes it is. For a baby to be born with Cystic Fibrosis, both parents must be carriers of the faulty CF gene. Where both parents carry the faulty gene, each child has a one in four chance of having CF, a two in four chance of being a carrier and a one in four chance of not having any CF genes.


Is cystic fibrosis geneitc?

Yes it is a genetic disorder. For a baby to be born with Cystic Fibrosis, both parents must be carriers of the faulty CF gene. Where both parents carry the faulty gene, each child has a one in four chance of having CF, a two in four chance of being a carrier and a one in four chance of not having any CF genes.


How is a child born with cystic fibrosis?

Cystic fibrosis is genetic and is not contagious A person gets it when he/she inherits two mutated genes off each parent. A healthy couple can have a child with Cystic fibrosis because the parents would be carriers of the disease (even though they are unaffected by it themselves). 25% of children are at risk of the disease as it can be passed down from previous generations.