Chasmogamy

These distinct seeds increase genetic diversity of the plant population and reduce inbreeding depression and deleterious alleles.

[2] Seeds produced by chasmogamous flowers that are cross-pollinated may also exhibit hybrid vigor (heterosis) and increased fitness.

To promote cross-pollination, chasmogamous flowers often have strikingly colored petals and nectar guides or nectaries to attract and reward pollinators.

[1][5] In addition to chasmogamy and cleistogamy, many plant species possess a mixed breeding system that utilizes both chasmogamous and cleistogamous flowers.

This leads to increases in genetic diversity and assures reproductive success in variable environmental and pollinator conditions.