How does DNA replication pass hereditary information to new cells?

DNA replication is the essential biological process that ensures hereditary information is accurately passed to new cells. This mechanism relies on the semiconservative nature of DNA, where the original double helix separates into two template strands.

The process involves several key steps:

• Unwinding: Enzymes called helicases separate the two strands of the double helix, while DNA topoisomerases relieve helical twists to prevent tangling.12
• Templating: Each parental strand acts as a template. DNA polymerase reads the nucleotide sequence and pairs free nucleotides with their complementary bases (adenine with thymine, and guanine with cytosine) to build a new strand.132
• Synthesis: Because strands are antiparallel, synthesis occurs continuously on the leading strand and in short segments called Okazaki fragments on the lagging strand.2
• Proofreading: To ensure high fidelity, DNA polymerase possesses a "proofreading" ability to correct errors during synthesis, and additional repair systems exist to fix genetic damage, preserving the integrity of the genetic code.13

Ultimately, each daughter DNA molecule consists of one parental strand and one newly synthesized strand, ensuring the genetic information is faithfully inherited.12