Emily’s friend Mark recently learned that he was adopted; although his parents tried to keep it a secret for as long as possible, he realized that he could not be their biological son because he has brown eyes, a dominant trait, while they both have blue eyes, a recessive trait. Is Mark correct in assuming he must be adopted because of his difference in eye colour?

Explanation:

Two blue eyed parents have a brown eyed baby Although it is uncommon, parents with blue eyes can have children with brown eyes. The inheritance of eye color is more complex than originally suspected because multiple genes are involved.

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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i would say it is