When an object remains stationary, are there any forces acting on it? If so, what forces?

For both stationary and moving objects with unchanging speed and direction, all the forces acting on the objects are in balance with each other, i.e. they all cancel each other out. Passive objects exert forces on objects that are exerting forces on them.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).