Question

Difference between autogamy geitonogamy and xenogamy

Answer 1

Biology - Pollination

Difference between autogamy, geitonogamy and xenogamy

1. Autogamy

• It is the fertilization of a flower by pollen from the same flower.
• Self pollination method.
• Produces a genetically identical offspring.
• Flowers can shed pollen grains directly onto the stigma and pollinate before it's opening.
• Pollination can occur even without the assistance of external pollinating.
• Genetic variations of the offspring are avoided.
• Sunflower, orchid and pea are the examples.

2. Geitonogamy

• It is the fertilization of a flower by pollen from another flower on the same plant.
• Functionally a cross pollination method.
• Produces a genetically identical offspring.
• Several flowers are located on the same stem.
• Can maintain the parental characters of the race indefinitely.
• Excess force should be generated in order to be pollinated by external pollinating agents.
• Corn is the most common example.

3. Xenogamy

• It is the fertilization of a flower by the pollen of a flower of the different plant.
• Cross-pollination method.
• Produces an offspring with genetic variations.
• Herkogamy, dichogamy, self compatibility, male sterility and heterostyly are the adaptions used.
• Produces genetically modified offspring with different characters to the offspring.
• Efficiency of the seed production depends on the external pollinating agents.
• Examples include squash, onions, spinach and grasses.

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