Pollen is released from stamens on the flower. Cross-pollination means genetic variety, the kind that comes from unrelated parents or flowers. The stigma does not become receptive to pollen until all of its own pollen is gone. Some plants are able to recognize their own pollen and reject it. Red flowers attract birds as pollinators and have no scent.
Scented flowers attract insects as pollinators.
The shape of the flower also affects who can be a pollinator. Edible pollen, nectar, and nutritious oils. DNA unravels from double helix - expose bases 2. RNA polymerase helps build mRNA starting at the promoter region of a gene 3. The use of living organisms for specific human functions.