Give differences Homozygous and Heterozygous

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Hence, in plants the pair of alleles for height would be $TT$ , $Tt$ or $tt$ . Mendel also proposed that in a true breeding, tall or dwarf pea variety the allelic pair of genes for height are identical or homozygous, $TT$ and $tt$respectively. 

In other words the hybrids have $Tt$. Since these hybrids contain alleles which express contrasting traits, the plants are heterozygous

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