The Hardy-Weinberg law describes the characteristics of a genetic population under ideal circumstances. This principle states that gene frequencies in a population, under ideal conditions, would:

a. remain stable over time

b. display directional selection

c. develop zygomatic plasticity

a. remain stable over time

Explanation:

Hardy-Weinberg law -

It states that, if there is no evolutionary influence like the mate choice, population bottleneck, sexual mutation, etc and the conditions are ideal in a population, then the gene and allele frequencies in that particular population remain constant from generation to generation.

Hence, from the options given in the question, the correct answer is (a) remain stable over time.