A trait has two alleles, and their frequencies are represented by p and q. If p = 0.68, what is q

Q = 0.32 because p + q = 1

As per Hardy Weinberg Principle, in a population mating in a random manner without any evolutionary force, the allele frequencies remains constant from generations to generations

Thus, sum of P and Q,

P = frequency of common allele

Q = Frequency of less common allele

Remains constant.

P + Q = 1

If P = 0.68

Then Q = 1 - P

= 1 - 0.68

= 0.32