Assortative in biological terms pertains to some biological traits. However, people more often assortative mate within thier social group. So you get an interse

Assortative in biological terms pertains to some biological traits. However, people more often assortative mate within thier social group. So you get an intersection of both but with the social factor vastly enhanced compared to biological. You cannot easily have children with someone you never met, after all, barring IVF with an unknown donor.