A woman with attached (recessive) earlobes has a child with a man who is heterozygous for earlobes.

What are the odds the child is a female with attached earlobes?

50%

Explanation:

The mother's genes are aa, and the father's genes are Aa.  When you do the punnett square you get the following in the square:

Aa    aa

Aa    aa

The only way a child will have attached earlobes is to be aa.  There are 2 possibilities out of 4 total.  2/4 = 50%.  Thus for a child to have attached earlobes is 50%

segmentation=endoskeleton=backbone=coelom=tissues

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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