- Pollination refers to the transfer of pollen grains from anthers to stigmas.
- Pollen from an anther may fall on to the stigma of the same flower leading to self-pollination or Autogamy.
- When pollen from flowers of one plant are transmitted to the stigmas of flowers of another plant, it is known as cross-pollination or allogamy.
- A third situation, geitonogamy, results when pollen from a flower of one plant falls on the stigmas of other flowers of the same plant, e.g., in Maize.
- The genetic consequences of geitonogamy are the same as those of autogamy.
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