Why does sexual reproduction result in more genetic variation in a species apex?

Sexual reproduction involves the formation of offspring with the help of two parents ( a male and a female). Genetic variation occurs in case of sexually reproducing organisms as gene variants ( alleles) in reproductive cells ( gametes) are segregated and randomly fused during fertilization.

Genes also undergo genetic recombination (during crossing over in homologous chromosomes ) during meiosis ( particularly in Pachytene stage of Prophase 1).

As a result, when sex cells ( gametes such as eggs and sperms) randomly combine during fertilization to produce offspring, there is an increase in genetic variation.

Thus, sexual reproduction result in more genetic variation in a species apex.

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