The brain communicates with the rest of the body through the

The brain is the super organ of the body , it sends signals and communicates with the other parts of the body through the central nervous system.

Explanation:

The brain is the organ that reacts and responds to various activities that take place in the body. The signals are in the form of chemical or electrical impulses that are sent across the organs of the body.

The activities that happen across the organ systems are communicated to the brain and the necessary measures are got from the brain through sending impulses or chemical signalling molecules.

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