Why are two letters used to denote the character of height?
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This is to show that each trait is influenced by both paternal and maternal DNA.
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To show both the character or trait ( dominant and recesive ) which is responsible for the tallness of plant ..
Because TT will also show tallness and Tt will also express tallness ... to know that 'T' is expresed and showed its dominancy it is important to write both the traits i.e Tt or TT or tt
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