About Hemophilia
If your blood can't do what is shown above, than you probably have hemophilia
Hemophilia is a rare bleeding disorder in which the blood doesn't clot normally. Compared to other people, people with hemophilia normally bleed for a longer time after an injury. People with hemophilia tend to bleed internally (inside their body). Their knees, elbows, and ankles is the spot that people with this disease tend to bleed more often. This bleeding can cause damage in the person's organs and can be life threatening.
There are two types of hemophilia, hemophilIa A ( also known as classic hemophilia) and hemophilia B ( also known as Christmas disease). Hemophilia A have low level of blood clotting factors called factor eight and Hemophilia B have low level of blood clotting factor nine. Both types of hemophilia are caused by mutation. Hemophilia A is more common than hemophilia B.
Causes
Hemophilia A and B are both caused by a genetic defect present on the X chromosome. Both hemophilias are sex-linked diseases mostly passed from the mother to the son. A female child always receives two x chromosomes that is why if she were to receive one flawed chromosome, she would be able to produce a right amount of factors VIII and IX to avoid hemophilia's symptoms. Even though the female child would be able to protect herself, her son wouldn't. He wouldn't be able to protect himself because male inherit one X and one Y chromosome and, therefore, have one X chromosome. That is only the case if the son were to receive the flawed chromosome. If were to be the case, he would be able to produce the sufficient of factors VII or IX and would end up suffering of hemophilia.
In other words the cause of hemophilia is mutation.
Symptoms
Excessive bleeding and easy bruising are the major symptoms in hemophilia. Depending on how severe the hemophilia is on the hemophilic, depends on the extent of the bleeding. Signs of external bleeding are: nose bleeding from no particular reason, bleeding in the mouth from a cut, heavy bleeding from a small scrap, and bleeding from a cut that had stopped for a short period of time.
As stated above, people's knees, elbows, and ankles are body parts in which this disease tends to take place more often. I believe that hemophilia affects the genes in the nucleus of our cell.