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DNA replicates before a cell divides to give a complete set of genetic instructions to each daughter cell. Semiconservative replication means that only one strand of DNA molecule is newly formed. The other stand is original DNA from the parent cell.


Meiosis is a reduction division in which genetic information from parent cell is delivered to the daughter cells. The DNA is duplicated before division because to provide complete set of genetic instructions to each daughter cell.

Meiosis is a type of cell division in which the number of chromosomes are halved, such that diploid parent cell give rise to two haploid cell. The duplication of DNA is necessary because:

  • To provide complete set of genetic information to each daughter cell, DNA is duplicated.
  • The duplication ensures that the daughter cells have same of number of chromosomes as parent cell (after fertilization).
  • The semiconservative model explains that every new molecule of DNA will be made of an original copy of DNA and other strand will be newly synthesised.

Thus, the DNA is duplicated to ensure daughter cells get all the genetic information and semiconservative nature of DNA helps in phenotypic diversity, accurate, and fast replication of DNA.

To know more about DNA duplication, refer to the following link:

https://brainly.com/question/12153736?referrer=searchResults

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