Explain the types of variation ?

Explanation

Variations are the differences found among individuals of the same species and the off spring of the same parent. New species originates by the gradual accumulation of variations. Evolution would not be possible without variation.
Somatic variation and germinal variation are the two types of variations :
(a) Somatic variation :
The variation which affect the body (somatic cells of organisms are called somatic variation, which are not heritabls. They occur due to environmental factors.
(b) Germinal variation
The variations, which are produced in germ cells and inherited are called germinal variation
They are classified into two types.
(i) Continuous variation :
Small variations which occur among individuals of a population, and occur by gradual accumulation is called continuous variation. They are also called fluntuating variation e.g. skin colour, height and weight and colour of eye, etc.
(ii) Discontinuous variation :
These changes are sudden, which occur in an organism, due to mutations. These larg variations are not useful for evolution. e.g. short legged Ancon sheep and six or more digits (fingers) in human, etc.