Agenetically transmitted disorder that is characterized by progressive weakness and muscle fiber degeneration without evidence of nerve involvement or degeneration of nerve tissue is known as

Musclar dystrophy.

Explanation:

It is caused by interferences (mutation)with the protein(gene sequnce) for formation of healthy muscles. Therefore leading to abnomaliteis in muscles cells formation and functions

Two major types most common in males than females:

Becker muscular dystrophy, Duchenne muscular dystrophy.,etc.

Most symptoms includes;

Muscle stiffness, frequent falls, walking on toes, learning disabilities etc.

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the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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