# A trait has two alleles, and their frequencies are represented by p and q. if p = 0.90, what is q?

The sum of the frequency is equal to 1.  Therefore, we have the following equation:  p + q = 1  Substituting values we have:  0.90 + q = 1  Clearing the value of q we have:  q = 1 - 0.90  q = 0.10  Answer:  The value of q is given by:  q = 0.10

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