After replication of a DNA molecule how many strands of daughter DNA are formed and what happens to the parent DNA molecule?

Asked by 21janhvi.verma | 30th May, 2018, 02:55: PM

Expert Answer:

There were three models of replication possible from such a scheme: conservative, semi-conservative, and dispersive.

  • In conservative replication, the two original DNA strands, known as the parental strands, would re-basepair with each other after being used as templates to synthesize new strands; and the two newly-synthesized strands, known as the daughter strands, would also basepair with each other; one of the two DNA molecules after replication would be “all-old” and the other would be “all-new”. 
  • In semi-conservative replication, each of the two parental DNA strands would act as a template for new DNA strands to be synthesized, but after replication, each parental DNA strand would basepair with the complementary newly-synthesized strand just synthesized, and both double-stranded DNAs would include one parental or “old” strand and one daughter or “new” strand.
  • In dispersive replication, after replication both copies of the new DNAs would somehow have alternating segments of parental DNA and newly-synthesized DNA on each of their two strands.

Answered by Sheetal Kolte | 30th May, 2018, 04:37: PM