The principle originated by Gregor Mendel, stating that during the production of gametes  the two copies of each hereditary factor segregate so that offspring acquires one factor from each parent.
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Mendel's law of Segregation (or Law of purity of gametes) : 
The two alleles of a gene when present together in a hetero-zygote state, do not fuse or blend in anyway, but remain distinct and segregate during meiosis or in the formation of gametes so that each meiotic product or gamete will carry only one of them.
This law is based on the fact that the alleles do not show any blending and that both the characters are recovered as such in the F
₂ generation though one of these is not seen at the F₁ stage.
Segregation of genes is a universal phenomenon in all organisms reproducing by normal sexual method.
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