Sex-linked traits are more common in males than females because they are carried on the X chromosome and Y does not carry these genes. Explain the difference in females between a carrier and someone that has the condition.

I think it would be YZ

Explanation:

because female has both genes

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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it is called the mitotic spindle