Chance of Inheriting the Disorder
Chance of Being a Carrier*
50% for sons and daughters
25% for sons and daughters if both parents are carriers (each parent has one abnormal gene)*
67% for children with no symptoms of the disorder if both parents are carriers*
50% if only one parent has the gene
50% when the mother has the gene, usually only in daughters because the abnormal gene is often lethal in sons
50% for sons when the mother has the gene
50% for daughters when the mother has the gene
100% for daughters when the father has the gene
* Carriers have only one abnormal gene and usually have no symptoms of the disorder that the gene causes.
See also Carrier Screening Carrier Screening Genetic screening is used to determine whether a couple is at increased risk of having a baby with a hereditary genetic disorder. Hereditary genetic disorders are disorders of chromosomes or... read more and Inheritance of Single-Gene Disorders Inheritance of Single-Gene Disorders Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are made of a very long strand... read more .