Because the trait is carried only on the X chromosome, it is called sex-linked.
X-linked adrenoleukodystrophy (X-ALD), a sex-linked disorder characterized by progressive symptoms that begin as behavioral changes, muscle weakness, and speech difficulties.
Both factors VIII and IX are produced by a genetic defect of the X chromosome, so hemophilia A and B are both sex-linked diseases passed on from a female to male offspring.
A typical human being has 46 chromosomes: 22 pairs of non-sex linked chromosomes and one pair of sex-linked chromosomes that determine that person's sex.
Autosomal inheritance-Inheritance involving any of the autosomes (22 pairs) and not involving sex-linked chromosomes X and Y.
As a sex-linked genetic disorder, the daughters of males affected with X-ALD become carriers and the sons are not affected.
An autosomal disorder is one that occurs because of an abnormal gene on a chromosome that is not a sex-linked chromosome.
The exact pattern of genetic transmission was not known as of 2004, however; autosomal dominant, autosomal recessive, and sex-linked inheritance patterns have all been studied and rejected.
Glucose-6-phosphate dehydrogenase (G6PD) deficiency-A sex-linked hereditary disorder in which the body lacks an enzyme that normally protects red blood cells from toxic chemicals.