These odds do not mean that the children who inherit the abnormal X will show severe symptoms of the disease. If there are four children (two boys and two girls) and the father is affected (he has one abnormal X and has the disease) but the mother is not, the expected odds are: Two children (one girl and one boy) will not have the disease.Two children (one girl and one boy) will have the disease.If the mother carries the abnormal X gene, half of all their children (daughters and sons) will inherit the disease tendency.įor example, if there are four children (two boys and two girls) and the mother is affected (she has one abnormal X and has the disease) but the father does not have the abnormal X gene, the expected odds are: That is because daughters always inherit their father's X chromosome. The abnormal gene dominates the gene pair.įor an X-linked dominant disorder: If the father carries the abnormal X gene, all of his daughters will inherit the disease and none of his sons will have the disease. Sex-linked diseases are inherited through one of the sex chromosomes, which are the X and Y chromosomes.ĭominant inheritance occurs when an abnormal gene from one parent can cause a disease, even though a matching gene from the other parent is normal.
It also depends on whether the trait is dominant or recessive. It can be either an autosomal chromosome or a sex chromosome. Inheritance of a specific disease, condition, or trait depends on the type of chromosome that is affected.
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