How mendel told that traits are dominant or recessive
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Mendel crossed a tall pea plant with a dwarf pea plant of the same species.
He discovered that in F1 generation, all the resultant plants were tall.
This showed that those traits which were expressed in F1 generation were dominant traits. (here, tall)
Those traits which were not expressed in F1 generation were recessive traits (here, dwarf).
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