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The factors responsible for heredity and variation which were first analysed by Mendel. After several rediscoveries , 'factors' were refered to as 'genes', which are present on the chromosomes. Now, we all know that DNA is the genetic material. The phenomenon of the transmission of genetic characters from one generation to another generation is called heredity. Animals of a given species are alike because they inherit a certain set of genes from their parents.

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