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Difference between the self pollination and …

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Difference between the self pollination and cross pollination

Posted by Shilpi Bauri 4 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Sia ? 4 years, 3 months ago

Self-Pollination	Cross-Pollination
Transfer pollen grains from the anther to the stigma of the same flower.	Transfer pollen grains from the anther to the stigma of a different flower.
This process can take place in the same flower or a different flower of the same plant.	This process can take place between two flowers present on different plants.
It occurs in the flowers which are genetically identical.	It occurs between flowers which are genetically different.
Few species that exhibit self-pollination – Paphiopedilum parishii, Arabidopsis thaliana	Few species that exhibit cross-pollination – apples, daffodils, pumpkins and grasses
Causes homogenous conditions in progenies.	Causes heterozygous condition in progenies.
Self-pollination increases genetic uniformity and decreases genetic variation.	Cross-pollination decreases genetic uniformity and increases genetic variation.
Causes inbreeding.	Causes outbreeding.
Reduces the gene pool.	Maintains the gene pool.
Produces limited amounts of pollen grains.	Produces large amounts of pollen grains.
In self-pollination, both the stigma and anther simultaneously mature	In cross-pollination, both the stigma and anther mature at different times.
Transfers a limited number of pollens.	Transfers large numbers of pollen.
This process is carried out even when the flowers are closed.	For cross-pollination to happen, the flower should be open.
No need for pollinators to transfer pollen grains.	Require pollinators to transfer pollen grains.
Pollen grains are transferred directly to a flower’s stigma.	Pollen grains are carried via wind, insects, animals, water, etc.

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