What would be the best way to predict the probability of a baby having cystic fibrosis?
a.
by studying the parents’ karyotypes
b.
by studying the family’s pedigree chart
c.
by exploring new methods of genetic engineering
d.
by determining whether the parents have codominant alleles

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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cells spend most of their time in interphase