<span>the Fair Debt </span>Collection Practices Act, also know as the <span>FDCPA
(i know this is probably a little late) sorry :( </span>
Its stabilising. Since the selection pressure is against the extremes which are the normal blood and the sickle cell anaemia.
A male with a mutation in a gene on the X chromosome is typically affected with the condition. Because females have two copies of the X chromosome and males have only one X chromosome, X-linked recessive diseases are more common among males than females.
The substance that would be added in order to reverse the reaction would be any substance that is found in the product side. Adding a substance that tends to be a product will shift the equilibrium of the system and will allow the reaction to produce the substances that is found in the reactant side.