Question

how do Mendel's experiment show that the triat may be dominant or recessive?

Answer 1

By crossing a tall and a short plant, that is, TT*tt, he gets Tt and Tt as gamets. So, when Tt and Tt is crossed, we get it as a tall plant since wellness is the dominant trait. This dominant trait masses the recessive trait(shortness).

Answer 2

Dominant is which can express itself and recessive is that which can't express itself