Final answer:
Willebrand disease is a hereditary cause of abnormal function of platelets. It is characterized by inadequate production of clotting factors and is caused by a deficiency or dysfunction of von Willebrand factor.
Step-by-step explanation:
A hereditary cause of abnormal function of platelets is Willebrand disease. This disorder is characterized by inadequate production of clotting factors. Willebrand disease is caused by a deficiency or dysfunction of von Willebrand factor, a protein that helps platelets stick together and clot. Without this factor, individuals with Willebrand disease may experience abnormal bleeding and bruising.