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DNA replication and its significance Grade 12 Life Sciences Notes with Activities Questions and Answers

DNA replication and its significance Grade 12 Life Sciences Notes with Activities Questions and Answers You may learn about DNA replication and its importance on this website. Nucleic acids is covered in the Grade 12 Life Sciences Notes, which also offers review exercises with questions and solutions to aid students in getting ready for examinations and exams.

Notes

DNA replication takes place at interphase before mitosis or meiosis begins. DNA replication is the process during which a DNA molecule makes an exact copy (replica) of itself.

Steps of DNA replication:

1. The double helix unwinds.
2. Weak hydrogen bonds between nitrogenous bases break and two DNA strands unzip (separate).
3. Each original DNA strand serves as a template on which its complement is built.
4. Free nucleotides build a DNA strand onto each of the original two DNA strands by attaching to their complementary nitrogenous bases (A to T and C to G).
5. This results in two identical DNA molecules. Each molecule consists of one original strand and one new strand.

Importance of DNA replication Grade 12

DNA replication is important because it:

• Doubles the genetic material so it can be shared between the resulting daughter cells during cell division.
• Results in the formation of identical daughter cells during mitosis.

PDF Downloadable Notes on The structure of DNA and RNA

Life Science Study Guides for Grade 12

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