How long does it take for Homo sapiens to replicate their DNA?

How long does it take for Homo sapiens to replicate their DNA?

• A. A few seconds
• B. A few hours
• C. A week
• D. A month

Answer: (B)

DNA replication in human cells happens during the S phase of the cell cycle, when the genome is copied before cell division. The human genome has about 3 billion base pairs, and replication starts at many origins of replication across chromosomes. Replication forks move along the DNA to synthesize new strands, with polymerases adding nucleotides and proofreading to ensure accuracy. Because replication occurs at thousands of origins in parallel, the entire genome can be copied in several hours rather than seconds or days. In most dividing human cells, S phase lasts roughly 6–8 hours, so the overall DNA replication time is in the few-hour range.

DNA replication in human cells happens during the S phase of the cell cycle, when the genome is copied before cell division. The human genome has about 3 billion base pairs, and replication starts at many origins of replication across chromosomes. Replication forks move along the DNA to synthesize new strands, with polymerases adding nucleotides and proofreading to ensure accuracy. Because replication occurs at thousands of origins in parallel, the entire genome can be copied in several hours rather than seconds or days. In most dividing human cells, S phase lasts roughly 6–8 hours, so the overall DNA replication time is in the few-hour range.