Types of Variation:
1. Meristimic Variation:
It is the differences in the number of body parts e.g. presence of six fingers instead of five.
2. Substantive Variation:
It is a variation where difference occurs in the shape size and colour etc. e.g colours of skin, hair and shape of ear ,nose body etc.
3. Continuous Variations:
These are minute differences in a population where one individual shows continuous differences from the other with intermediate forms.
4. Discontinuous Variation:
Those are large differences and appear suddenly with out intermediate stages. These sudden changes are called mutations e.g. appearance of six fingers in a man.
5. Somatic Variation:
The variation of somatic cells by the influence of environmental factors called somatic variation e.g. Lamarck’s acquired characters in Giraffe.
6. Germinal variation:
The differences appearing in germ cells is called germinal variation. These variations are heritable.