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The q^2 (Homo Rec) given was .27. To get the q by its self, you square root the number. Then you will have .52 for q (Rec Allele). To get p (Dom Allele), you subtract .52 from 1. This is because the alleles p + q equal 1. This gives us .48 for the p. Then you square that number to get the p^2. You will have .23 as the p^2.  After you have p and q, you are able to find 2pq (hetero dom). You multiply 2 x .52 x .48. You will have .50 as the 2pq. 

After finding the all the variables, they will all equal 1 in the equation 

            p^2 + 2pq + q^2 = 1

After checking, you are able to find the percentages of the of the Dominant, Recessive, and Hetero individuals. 

To find the number of Homo Dom individuals, you multiply .23 x 1000 (the population). You will find that 230 individuals out of 1000 have the Dominant trait. 

To find the number of Homo Rec individuals, you multiply .27 x 1000 (the population). You will find that 270 individuals out off 1000 have the recessive trait. 

To find the number of Hetero Dom individuals, you multiply .50 x 1000 (the population). You will find that 500 of the individuals out of 1000 have the dominant trait and don't show the recessive allele.