How is the number of chromosomes and the DNA content maintained constant generation after generation sexually reproducing organisms ?

Explanation

For sexually reproducing organisms, each new generation is the combination of the DNA copies from two parents. So, each new generation gets twice the amount of DNA from parents.
But this does not happen because, for sexually reproducing organisms gamete producing cells undergo meiosis and hence chromosome number is reduced to half. Thus, there is half the amount of DNA as compared to the non-reproductive cells of body. Meiosis a type of cell division plays an important role for this. Thus, when two haploid germ cells from two individuals combine during sexual reproduction they form diploid zygote making number of chromosomes and the DNA content in the new generation same again.