Positive assortative mating increases genetic relatedness within a family, whereas negative assortative mating accomplishes the opposite effect. ... Also, positive assortative mating for behavioral traits allows for more efficient communication between the individuals and they can cooperate better to raise their offspring.

Why does positive assortative mating occur?

Rather strong positive-assortative mating may occur in plants when a pollinator forages at a given height or is attracted to a given flower color and, as a result, tends to pollinate plants similar to the ones where the pollen was collected.

What is the chief purpose of positive assortative mating give an example?

Population Genetics

Clinical examples of positive assortative mating are those between individuals who are profoundly hearing impaired or blind, which in some cases may be attributable to the same genotypes.