Idiopathic thrombocytopenic purpura (ITP) Idiopathic thrombocytopenic purpura (ITP) is a bleeding disorder in which the immune system destroys platelets, which are necessary for normal blood clotting. People with the disease have too few platelets in the blood. ITP is sometimes called immune thrombocytopenic purpura or simply, immune thrombocytopenia.
sex-linked disorder - any disease or abnormality that is determined by the sex hormones; hemophilia is determined by a gene defect on an X chromosome. bleeder's disease, haemophilia, hemophilia - congenital tendency to uncontrolled bleeding; usually affects males and is transmitted from mother to son.
Genes that are found on the sex chromosomes are called sex-linked genes. These genes can be on the X chromosome or on the Y chromosome. If a gene is located on the Y chromosome, it is a Y-linked gene.These genes are only inherited by males because, in most instances, males have a genotype of (XY). Females do not have the Y sex chromosome. Genes that are found on the X chromosome are called X-linked genes.enes that are found on the sex chromosomes are called sex-linked genes. These genes can be on the X chromosome or on the Y chromosome. If a gene is located on the Y chromosome, it is a Y-linked gene.