Final answer:
During DNA replication, two new double strands form, each retaining an original strand and adding a complementary new strand through semiconservative replication, thus preserving genetic information.
Step-by-step explanation:
During DNA replication, two new double strands of DNA are formed, each consisting of one strand from the original DNA molecule and one newly synthesized strand. This demonstrates the principle of semiconservative replication, where each new DNA molecule retains one original, or 'parental', strand and gains one 'daughter' strand that is complementary to it. This process ensures that the genetic information contained in the DNA is accurately transferred to the two daughter cells.