Table of Contents
- 1 What are the chances of cystic fibrosis if both parents are carriers?
- 2 Is it possible for a child to be born without cystic fibrosis allele of this gene If both parents are carriers of trait?
- 3 What are the odds that two individuals carrying a cystic fibrosis allele will have a child who carries the cystic fibrosis allele?
- 4 Can a child be born with cystic fibrosis and not have it?
- 5 What are the chances of having a non-CF child?
- 6 Can a person be a carrier of cystic fibrosis without symptoms?
What are the chances of cystic fibrosis if both parents are carriers?
An individual must inherit two non-functioning CF genes – one from each parent – to have CF. If both parents are carriers there is a 1 in 4 (25 percent) chance that both will pass on the non-functioning gene, which would result in a pregnancy affected with cystic fibrosis.
Is it possible for a child to be born without cystic fibrosis allele of this gene If both parents are carriers of trait?
For example in cystic fibrosis if both parents are heterozygous, each child has a 25% chance of being born with cystic fibrosis….Mendelian Genetics.
| Genotype | Phenotype | |
|---|---|---|
| f f | Homozygous recessive | Cystic fibrosis (has symptoms) |
What are the odds that two individuals carrying a cystic fibrosis allele will have a child who carries the cystic fibrosis allele?
They are called “CF carriers.” Each time two CF carriers have a child, the chances are: 25 percent (1 in 4) the child will have CF. 50 percent (1 in 2) the child will be a carrier but will not have CF.
What are the chances of having a child with cystic fibrosis if one of the parents has the disorder and the other is heterozygous?
In example 1, both parents are heterozygous, Ff. The chance of them producing a child with cystic fibrosis is 1 in 4, or 25%. The parents are carriers of the disorder, and it is possible for them to produce a child with cystic fibrosis, without having it themselves.
Can you get CF if your parents don’t have it?
A child will be born with CF only if they inherit one CF gene from each parent. A person who has only one CF gene is called a CF carrier. They are healthy and don’t have the disease….The Genetics of Cystic Fibrosis.
| Ethnic Background | Risk of CF Mutation | Risk of Child with CF |
|---|---|---|
| Asian-American | 1 in 90 | 1 in 100,000 |
Can a child be born with cystic fibrosis and not have it?
When this happens, the child cannot have CF disease and is not a CF carrier. Each time a child is conceived by 2 CF carriers, the chance that the baby will have CF disease is 1-in-4 (25%). Some parents think that if they have had 1 child with CF, their other children will be born without the disease.
What are the chances of having a non-CF child?
There is a 1-in-4 chance (25% of the time) the child will receive non-CF normal genes from each parent. When this happens, the child cannot have CF disease and is not a CF carrier.
Can a person be a carrier of cystic fibrosis without symptoms?
This is because a person who is a CF carrier must have a child with someone else who is also a CF carrier and both of them have to pass the abnormal gene to the child. Families may have CF carriers who do not have symptoms and have not had a child who received 2 abnormal CF genes.
What are the chances of inheriting cystic fibrosis?
If, however, one parent has two defective genes and the other parent has one defective gene, a child has a 50 percent chance of inheriting the condition [source: Lucille Packard Children’s Hospital at Stanford ]. Cystic fibrosis is most common in Caucasians of northern European descent.