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Biology
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Biology
Types and Factors of Variation
Biology
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Types and Factors of Variation
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Variations in pairs of identical twins
There are differences in phenotype if observed, even if from the same ovum
Variation of the butterfly species Biston betularia
Dark-coloured butterflies survives better than light-coloured butterflies during the pollution caused by the industrial revolution
The importance of variation to the survival of Biston betularia butterfly species
Darker butterflies can survive better because they are not easily seen by birds of prey during pollution in the environment
Type of variation
Continuous variation and discontinuous variation
Continuous variation
Variation in which the differences in the characteristics is not distinct
Example of continuous variation
Height, body, weight and skin colour
Discontinuous variation
Variations that show distinct differences in characteristics
Example of discontinuous variation
Ability to roll tongue, eye colour and fingerprint pattern
Continuous variation is quantitative
Can be measured and graded from one extreme to the other extreme
Discontinuous variation is qualitative
Cannot be measured or graded because characteristics can only be determined by genetic factor
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