What is semi-conservative replication?

Semi-conservative replication is a fundamental process in DNA replication where each new double-stranded DNA molecule consists of one original (template) strand and one newly synthesized strand. This means that during replication, when the DNA unwinds and separates into two strands, each of those strands serves as a template for the formation of a new complementary strand. As a result, the daughter DNA molecules are composed of one old (parental) strand and one new strand, effectively conserving half of the original DNA in each new molecule.

This method of replication ensures the accuracy and integrity of the genetic information being passed on during cell division, as it allows for the pairing of complementary nucleotides to occur, leading to a precise duplication of the genetic material. The reference to a "template strand and a new strand" encapsulates the key mechanism of how semi-conservative replication works, making it the correct answer.