| Soybeans exhibit a high percentage of self-fertilization, and cross pollination is usually less than one percent. |
| Both individuals and gametes were unisexual, and self-fertilization was allowed. |
| Both types of cleistogamous flowers are fertile and undergo self-fertilization. |
| Chemical self-incompatibility is another device for preventing self-fertilization. |
| In the flower where the father and mother part matures at the same time, self-fertilization is the rule. |
| Physid snails usually cross-fertilize but are capable of occasional self-fertilization. |
