Before mitosis begins, which process copies the DNA to ensure each daughter cell receives a full set?

Before mitosis begins, which process copies the DNA to ensure each daughter cell receives a full set?

• A. DNA replication
• B. Transcription
• C. Translation
• D. Splicing

Answer: (A)

DNA replication copies the entire genome before a cell divides. During the S phase of interphase, the double helix unwinds and each strand serves as a template for a new complementary strand, powered by DNA polymerases. This produces two identical copies (sister chromatids) of each chromosome that will be separated during mitosis, so every daughter cell inherits a complete set of genetic information. Transcription makes RNA from DNA, translation uses RNA to build proteins, and splicing edits RNA—none of these duplicate the genome for cell division.

DNA replication copies the entire genome before a cell divides. During the S phase of interphase, the double helix unwinds and each strand serves as a template for a new complementary strand, powered by DNA polymerases. This produces two identical copies (sister chromatids) of each chromosome that will be separated during mitosis, so every daughter cell inherits a complete set of genetic information. Transcription makes RNA from DNA, translation uses RNA to build proteins, and splicing edits RNA—none of these duplicate the genome for cell division.