In some people blood does not coagulate. Give the reasons for it?

Explanation

1) Normally the blood that comes out from a wound clots in 3-6 minutes. But in some people due to vitamin K deficiency it takes more time to clot.
2) Due to genetic defect blood may not coagulate. This type of defect is called Haemophilia.
3) Haemophilia is a common disorder in the children who have born from the marriages between very close relatives.