Every organism differs from one another; this difference is referred to as variation. Variations are accumulated during reproduction. The asexual reproduction does not create much variation in individual since they almost produces offspring just like clones. Where as the sexual reproduction helps in incorporating large variations since all the individuals produce as a result are different from each other. The process of crossing over in the sexual reproduction creates genetic variants. Some of the variations are created by mutation. It helps the individuals to adapt to the changing environment.