The thin filaments and thick filaments and their associated proteins are the key functional components of the sarcomere. it is important to be able to identify these components in order to understand their roles in muscle contraction.

Muscle is composed of small units known as myofibril which itself composed of cylindrical bundles of thread like filaments; thick filament and thin filament known as myosin and actin respectively.

These filaments make up a myofibril which is organized into a chain of contractile units called sarcomeres. . There are two more proteins known as titin and nebulin which also contribute to the structure of sarcomere.

The function of the muscle is to contract and these filaments play a major role in it

the genotypes would be 50% bb and 50% bb

the phenotypes would be 50% brown and 50% white. hope this : )