NEETZoologyPrinciples of Inheritance and Variation
How does Haemophilia affect blood clotting?
Options
- AIt prevents blood from clotting, leading to continuous bleeding
- BIt causes excessive clotting and formation of clots
- CIt strengthens the clotting mechanism making it too efficient
- DIt only affects the red blood cells' ability to carry oxygen
Correct answer
A. It prevents blood from clotting, leading to continuous bleeding
Step-by-step solution
This sex linked recessive disease, which shows its transmission from unaffected carrier female to some of the male progeny has been widely studied. In this disease, a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected. Due to this, in an affected individual a simple cut will result in non-stop bleeding. The heterozygous female (carrier) for haemophilia may transmit the disease to sons. The possibility of a female becoming a haemophilic is extremely rare because mo