What is the advantage of sexual reproduction?

Asexual species, for the most part, are relatively short-lived offshoots of sexual ancestors. From the nineteenth century, it has been recognized that, since there is no obvious advantage to the individuals involved, the advantages of sexual reproduction must be evolutionary. Furthermore, the advantage must be substantial; for example, producing males entails a two-fold cost, compared to dispensing with them and reproducing by parthenogenetic females. 

The advantages of sexual reproduction are as follows:

1> There are genetic variations which leads to evolution.
2> Children differ from their parents. In asexual reproduction, offsprings are the same as parents.
3> There is variety in population.
4> Offsprings are more developed than their parents and their survival chances incresase.

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