gene is fragment of dna and what is the difference between these two terms
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Gene:

Gene is a specific segment of DNA molecule which determines the inheritance and expression of a particular character.

It is the functional unit of heredity which carries information from one generation to the next.

Allele:

Two or more alternative forms of a gene are called alleles or allelomorphs. They occupy the same gene locus on homologous chromosomes but produce different effects on the phenotypes.

Example:

In pea, gene for producing height of plant may occur in two alternative forms: Tall(T) and Dwarf(t). Tall and Dwarf forms of gene are alleles of each other.

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