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Answer -
The Law of Dominance was proposed by Mendel. It states that a dominant allele expresses itself in a monohybrid cross and suppresses the expression of recessive allele. But the recessive allele for a specific character is not vanished but remains masked or hidden in the progenies of F1 generation which resurfaces in the subsequent generation.
Example- When a monohybrid cross between two pea plants having round seeds (RR) and wrinkled seeds(rr) was carried out, all the seeds in F1 generation were observed to be round (Rr). If the round seeds were self-fertilized both the characters – round and wrinkled seeds appeared in F2 generation in 3:1 ratio. Therefore, in F1 generation, the character that is dominant i.e., the round seeds surfaced and the recessive character i.e., the wrinkled seeds got suppressed that resurfaced in the F2 generation.