in sexual reproduction :- 
           1: in this two parents are involved
           2: this happens through fertilization 
           3: this has gametes formation
in asexual reproduction :- 
           1: in this only one parent is involved
           2: this happens through budding etc.
           3: this has no gametes formation
            i hope that my answer will help u................................^_^
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Asexual reproduction:It is  mainly shown by lower organism without formation of gametes
In asexual reproduction asexual spores are involved which are produced without meiosis and it is uniparental and chance of evolution is less
sexual reproduction:It is complicated process shown by mainly higher organisms 
It can cause by sexual spore formed by meiosis and formation and fution of gametes occur and it is bi parental and chance of evolution is high