How does the amount of DNA remain constant though each new generation is a combination of DNA copies of two individuals

Solution:

In sexual reproduction the gametes (haploid) usually contain half number of chromosomes compared to the original body cells (which are diploid). These haploid gametes when fuse together during fertilisation produce a new cell with double number of chromosomes than the gametes and same as the body cells. In this way organisms restrict doubling of DNA and maintain the chromosome number in every generation. 
 

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