If other traits are measured, assortative mating will again be found.
It presupposes no assortative mating, no inbreeding and no selection.
In this case, the mathematician can give us a coefficient of resemblance, or of assortative mating, which we write as zero.
But in any case the existence of assortative mating for such traits is significant.
assortative mating as·sor·ta·tive mating (ə-sôr'tə-tĭv)
Nonrandom mating in which individuals mate preferentially according to phenotype.