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DNA content has the tendency to double i...

DNA content has the tendency to double itself during sexual reproduction due to combining of the genetic materials from two parents. How can the problem of DNA doubling be solved to maintain the consistency of the genetic material throughout the species?

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(i) Germ-cells from two individuals combine.
(ii) Chromosome number and DNA content is halved in special linkage cells in specialized organs.
(iii) Takes place in reproductive cells maintaining the DNA content.
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