Somatogenic variations and Blastogenic variations: Major Differences
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Somatogenic
variations
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Blastogenic
(Germinal) variations
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1.
It involves somatic cells
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It involves germ cells
of gonads.
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2.
It is also called acquired
variation as it occurs during the lifespan of an individual.
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It occurs in gametogenesis
in parents
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3.
It is developed in response
to changes in environmental factors like temperature, food, humidity, light intensity
etc
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It is developed due to
mutations or recombination of genes
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4.
It is not heritable.
It has no role in heredity and evolution and is lost with the death of organism.
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It is heritable variation.
It transmits from one generation to another. It has great role in evolution.
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5.
Examples: Better developed
muscles in an athlete, gymnastics etc. Development of median eye in the larva
of Fundulus fish developing in magnesium chloride containing water.
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Examples: Polydactyly
in man
Sickle cell anaemia
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