Explain how sexual reproduction gives rise to more viable variations than asexual reproduction?
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1) Variations occurring during sexual reproduction may be due to separation of homologous chromosomes during gamete formation.
2) Crossing over of homologous chromosomes.
3) Fertilisation of gamete form zygote.
4) Errors during DNA copy mutation.
In asexually reproducing organisms only error during DNA copying or mutation cause variations.
Since the extent of variation is much larger in sexually reproducing organisms. Therefore the choices of evolution is much higher in sexually reproducing organisms. These variations enable the organism adopt themselves to the struggle for existence. Over the time , they accumulate and give rise to new species.