Each box inside a punnett square represents one ?

one genotype of the offsprings.

Explanation: A punnett square is a diagram used I'm predicting the possible genotypes of a cross between two organisms. Punnett square is used to predict the probability that an offspring will have a particular genotype. In punnett square, the parents' genotypes are written on the top and the left side of the square while the possible genotypes of their offsprings are written in the boxes.

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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