1. In a total population of 300 adults, it was found that 200 were blondes and 100 were redheads. Upon closer examination, it was found that having red hair was the result of a recessive trait. Biochemical analysis revealed that blondes composed two genotypes: homozygous (40 individuals), and heterozygous (160 individuals). Use chi-squared analysis to determine if this population is in Hardy-Weinberg equilibrium for this gene.

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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not sure if this what   you'r looking for would be percent composition