In a population of rabbits, the frequency of q is 0.37. what is the frequency of p?
0.37
0.50
0.63
0.86

If we have a population of rabbits with a frequency of q which would be 0.37 in this case then we have to use this number and substract it from 1 to receive the frequency of p. 

The formula therefore is 1 - q  = p.

When we add this into our data, we see that p in this case is 0.63, as 1 - 0.37 = 0.63. 

Transpiration is the answer