How Mendal got to know about that the tall plant have TT gene or Tt gene?
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Solution:

After many trial and error, Mendel identified that some plants which looked tall on self pollination produced short offspring.
But some plant which looked tall, only produced tall offspring generation after generation.
Later he identified that since one character is controlled by two alleles, some plant have recessive allele which is not expressed in F1 generation but in F2 generation and hence he termed them hybrids or heterozygous (Tt).
Those who only produced Tall plants who only produced tall offspring generation after generation where termed as homozygous dominant (TT).

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