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When two heterozygous plants are crossed by Mendel, he got plants with two phenotypes i.e. 3/4th of the progenies showed dominant characters and 1/4th progenies showed recessive characters.

But three different genotypes were observed, i.e. 1/4th of the progenies were homozygous dominant, 1/4th were homozygous recessive and 2/4th of the progenies were heterozygous dominant.