(pls don't plagiarize) What might a clinician see in a karyotype showing a genetic disorder?

So first among some of the numerical abnormalities a karyotype can detect are down syndrome (trisomy 21), in which an extra chromosome 21 causes distinctive facial features, and intellectual disabilities. Lastly edward syndrome (trisomy 18), in which the extra chromosome 18 translates to a high risk of death before the first birthday.

Explanation:

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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