When Mendel crossed two pea plants with a pair of contrasting characters only one character appeared in all the members of F1 progeny, the other remains hidden.
On selfing F1, the hidden characters reappeared in just 25% of the offsprings and the other 15% shared the characters expressed in F1.
Mendel concluded that the character which expresses itself in F1 and in 75% of the individuals of F2 is dominating while the other is recessive.
