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How do Mendel's experiments show that tr...

How do Mendel's experiments show that traits may be dominant or recessive ?

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Mendel.s conducted, cross fertilisation between pure tall plant (TT) and pure short plant (tt) which resulted in all tall (Tt) plant in `F_(1)` generation.
This shows that single copy of T is enough to make the plant tall. It shows that one trait which is expressed in the presence of its contrasting form. This is dominant trait and the other remains unexpressed in the presence of its contrasting form is recessive trait.
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