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