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.
Sex-linked trait. Home Â» Sex-linked trait. Definition. noun, plural: sex-linked traits. A trait genetically determined by an allele located on the sex chromosome. Supplement. Since traits are sex-linked, there is usually a distinct pattern. For example, color blindness is a sex-linked trait whose allele is recessive and located on the X chromosome.