Explanation

Experiment Conducted by Hugo de Vries He conducted his experiment on oenothera lamarckiana (everning primorse) and found several different types of plants when plant was self pollinated and its seeds were allowed to grow, majority of $F_{1}$ plants were similar to the parents but few were different. Hugo de Vries suggested from his experiments that new types of inherited characters may appear suddenly without any previous indication of their presence in the race