Which of the following statements regarding tall and dwarf pea plants is incorrect based on their genetic constitution?
- AFor a tall plant,the presence of at least one '$T$' gene is sufficient.
- BFor a dwarf plant,it is necessary to have both '$t$' genes.
- C'$T$' is the dominant gene and '$t$' is the recessive gene.
- DThe genetic constitution of a tall plant cannot be '$Tt$'.
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