the sexual mode of reproduction incorporates the process of combining DNA from 2 diffrent individual. how is the problem of doubling of chromosomes overcome?

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Please find below the solution to the asked query:

Sexual reproduction keep the chromosome number constant from generation to generation because of the process of meiosis and fertilisation. Meiosis results in the equal distribution of chromosomes in each gametes that is haploid in number (means have 23 chromosomes). Each gamete carry 23 chromosomes in them which during fertilisation process fuse with other gamete carrying 23 chromosomes and form a zygote with 46 chromosomes (diploid). Now the offspring produced from that zygote will have 46 chromosomes which remain same from generation to generation in this way.  

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in case of sexual reproduction each of the parents produce respective sex cells such as sperms and ovums by the process of haploid division having 23 chromosomes each ( one from each pair of 23 pairs)
23+23=46
hence the zygote contains 46chromosomes or 23 pairs of chromosomes.
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