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Cell Division

Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis.

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Student-friendly explanation

Mitosis produces two identical daughter cells with the same chromosome number and is used for growth, repair, and replacement. Meiosis produces gametes with half the chromosome number, helping maintain chromosome number across generations after fertilisation.

How to write this in exams

  1. 1

    Start with the exact idea

    Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis.

  2. 2

    Then show how to use it

    Identify whether the question is about body cells or gametes, then write the division type, number of cells formed, chromosome number, and purpose.

  3. 3

    Add one concrete example

    Skin cells divide by mitosis for repair, while reproductive organs form gametes by meiosis.

  4. 4

    Avoid this incomplete answer

    Writing that mitosis halves chromosome number is wrong because mitosis maintains chromosome number in daughter cells.

Definition

Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis.

Example

Skin cells divide by mitosis for repair, while reproductive organs form gametes by meiosis.

Rule to remember

Mitosis: 1 parent cell forms 2 similar daughter cells. Meiosis: 1 parent cell forms gametes with half chromosome number.

Memory hook

Mitosis maintains; meiosis makes gametes.

Examples and method

Worked example

If a body cell has 46 chromosomes, mitosis forms daughter cells with 46 chromosomes each; meiosis forms gametes with 23 chromosomes each.

Method to apply

Identify whether the question is about body cells or gametes, then write the division type, number of cells formed, chromosome number, and purpose.

Diagram support

Use a comparative flow diagram showing mitosis producing two cells and meiosis producing gametes with reduced chromosome number.

How CBSE asks it

Exams may ask differences between mitosis and meiosis or why meiosis is important for sexual reproduction.

Avoid common mistakes

Common confusion

Students often write that meiosis produces two identical cells, but meiosis produces four genetically different gametes with half the chromosome number.

Common wrong answer

Writing that mitosis halves chromosome number is wrong because mitosis maintains chromosome number in daughter cells.

Exam tip

In comparison questions, always write number of daughter cells, chromosome number, and purpose.

Quick check

How is mitosis different from meiosis in outcome?

Mitosis forms two identical daughter cells with the same chromosome number, while meiosis forms gametes with half the chromosome number.

Study the cell division diagram carefully

Use the labelled diagram to keep cell division clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of cell division in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on cell division.

Revision cue

Revise cell division through the labels before writing the answer.

Answer writing and exam use

1-mark answer

Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis.

2-mark answer

Cell division is the process by which a parent cell divides to form new cells, mainly through mitosis or meiosis. Mitosis: 1 parent cell forms 2 similar daughter cells. Meiosis: 1 parent cell forms gametes with half chromosome number. Skin cells divide by mitosis for repair, while reproductive organs form gametes by meiosis.

3-mark answer

Mitosis produces two identical daughter cells with the same chromosome number and is used for growth, repair, and replacement. Meiosis produces gametes with half the chromosome number, helping maintain chromosome number across generations after fertilisation. Mitosis: 1 parent cell forms 2 similar daughter cells. Meiosis: 1 parent cell forms gametes with half chromosome number. If a body cell has 46 chromosomes, mitosis forms daughter cells with 46 chromosomes each; meiosis forms gametes with 23 chromosomes each. Exams may ask differences between mitosis and meiosis or why meiosis is important for sexual reproduction. Writing that mitosis halves chromosome number is wrong because mitosis maintains chromosome number in daughter cells.
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