Self pollination and Cross pollination:
Major differences
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Self pollination
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Cross pollination
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1.
Pollen grains are
transferred to stigma of same or genetically similar flower.
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Pollen grains are transferred to stigma of genetically
different flower
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2.
Anthers and stigma
mature simultaneously
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They mature at different time i.e, protandry and
protogyny
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3.
It occurs in open as
well as closed flower
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It occurs only in open flower
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4.
It is very
economical for plants
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It is not economical as the plant has to produce large
number of pollen grains, nectar, scent and colouration
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5.
External agencies
are not required
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It depends on external agencies
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6.
Young ones are
homozygous
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Young ones are heterozygous
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7.
It produces pure
lines because of the non-occurrence of genetic recombination
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It produces variations due to genetic recombination
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8.
It cannot eliminate
harmful traits
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It can eliminate harmful traits
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9.
Useful characters
are preserved
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Not preserved
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10.
No adaptability in
the changing environment
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It provides adaptability
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11.
It cannot introduce
new traits
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It can introduce new traits
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12.
Disease resistance is
low
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Disease resistance is optimum
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13.
There is decrease in
yield
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It increases the yield
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14.
It does not help in the
development of new species
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Helps in the development of new species
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