How does an amount of dna remain constant though each new generation is a combination of dna copies of two individuals?
Answers
This is due to the replication of DNA in s phase of cell division and equal number of chromosomes arrange itself on cell plate at metaphase estate and in anaphase anaphase the chromosome separate and telophase the cell separate so the number of DNA and chromosome remain same in cell during division
Sexually reproducing organism contain separate cells for reproduction known as gametes. These cells undergo meiotic division for their formation.
The offspring in the next generation is formed by the fusion of two gametes.
Therefore, meiotic division ensures gametes have half the number of chromosomes as that of a regular cell of the same organism, such that when two gametes fuse two cells each containing half the DNA amount as that of a regular cell combine to form one embryo with the same amount of DNA as a regular cell of the organism.
This embryo then divides to form a regular organism with the required amount of DNA of which two halves of its amount are from different individuals.