1. Introduction:
The genetic information of a cell is coded in its DNA sequences. A base change in this DNA sequence causes a corresponding change in the genotype and the corresponding phenotype. These changes are often inherited by the progeny cell during cell division. Now we know that phenotype is not just influenced by the genetic information stored in the DNA sequence, but also the micro and macro environment of the cells. Two identical DNA sequence can give different phenotypes in different environment. Even two genetically identical twins when raised in different environment can show a number of variations.
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