Understanding the cell cycle is very important for Class 12 Biology students, especially for Punjab Board exams. This chapter explains how cells grow, duplicate their DNA, and divide into new cells through processes like interphase, mitosis, and meiosis.
In this post, you will get complete and easy-to-understand notes of Chapter 21 – Cell Cycle, including important topics like cancer (uncontrolled cell division), meiotic errors, Down’s syndrome, and cell death (necrosis and apoptosis). These notes are specially designed to help students in quick revision and exam preparation.
📥 Download Class 12 Biology Chapter 21 – Cell Cycle Notes PDF
Get complete and exam-focused notes of Class 12 Biology Chapter 21 – Cell Cycle in one PDF file. These notes are specially prepared for Punjab Board students to help in better understanding and quick revision before exams.
Skip to PDF content✔️ Covers all important topics: Interphase, Mitosis, Meiosis
✔️ Includes concepts like Cancer, Non-disjunction, Down’s Syndrome
✔️ Easy explanations for quick learning
✔️ Helpful for board exam preparation
👉 Download PDF: Class 12 Biology Chapter 21 – Cell Cycle Notes
❓ Frequently Asked Questions (FAQs)
1. What is the cell cycle?
The cell cycle is the sequence of events through which a cell grows, replicates its DNA, and divides into two daughter cells.
2. What are the main phases of the cell cycle?
The cell cycle consists of two main phases: Interphase and M phase (Mitosis or Meiosis).
3. What happens during interphase?
During interphase, the cell grows, performs normal functions, and duplicates its DNA in preparation for cell division.
4. What is the difference between mitosis and meiosis?
Mitosis produces two identical daughter cells, while meiosis produces four genetically different haploid cells.
📝 MCQs – Cell Cycle
1. Interphase consists of which phases?
A) Prophase, Metaphase, Anaphase
B) G1, S, G2 ✅
C) M phase only
D) Cytokinesis only
2. DNA replication occurs during which phase?
A) G1 phase
B) S phase ✅
C) G2 phase
D) M phase
3. Mitosis produces how many daughter cells?
A) One
B) Two ✅
C) Three
D) Four
4. The daughter cells produced in mitosis are:
A) Genetically different
B) Haploid
C) Identical to parent cell ✅
D) Always mutated