Mitosis vs Meiosis: Differences, Stages & Diagram Explanation

Mitosis vs meiosis comes down to one idea. Mitosis makes two identical cells with the same number of chromosomes, for growth and repair. Meiosis makes four different cells with half the number of chromosomes, to form gametes (sperm and egg).

Both are types of cell division, studied in Class 9 and 10 and in detail in Class 11 Biology. Below are the stages of each, a full difference table and tips for drawing the diagrams.

Why Do Cells Divide?

Growth: a baby grows into an adult because its cells keep dividing. Repair: a cut on the skin heals as new cells replace damaged ones. Reproduction: special cells divide to form gametes.

Before dividing, a cell goes through interphase, when it grows and copies its DNA. After copying, each chromosome has two identical sister chromatids joined at a centromere.

Mitosis: The Stages

Mitosis has four stages. Remember them as PMAT: Prophase, Metaphase, Anaphase, Telophase.

Stage	What happens
Prophase	Chromosomes condense and become visible; the nuclear membrane starts to break down; spindle fibres begin to form.
Metaphase	Chromosomes line up in a single row at the middle of the cell (the metaphase plate).
Anaphase	Sister chromatids separate and move to opposite poles of the cell.
Telophase	A nuclear membrane forms around each set of chromosomes; chromosomes uncoil.

After telophase comes cytokinesis, the division of the cytoplasm, giving two identical daughter cells. One human body cell with 46 chromosomes gives 2 cells with 46 chromosomes each.

Meiosis: The Stages

Meiosis has two divisions, Meiosis I and Meiosis II, each with its own PMAT stages.

Meiosis I (the "reduction division")

Stage	What happens
Prophase I	Homologous chromosomes pair up. Crossing over happens: pieces of DNA are exchanged between them.
Metaphase I	Homologous pairs line up at the middle.
Anaphase I	Homologous chromosomes separate. Sister chromatids stay together.
Telophase I	Two cells form, each with half the chromosome number.

Meiosis II (similar to mitosis)

Stage	What happens
Prophase II	Chromosomes condense again.
Metaphase II	Chromosomes line up at the middle of each cell.
Anaphase II	Sister chromatids separate.
Telophase II	Four cells form.

One human cell with 46 chromosomes gives 4 cells with 23 chromosomes each, all genetically different.

Mitosis vs Meiosis: Difference Table

Point	Mitosis	Meiosis
Purpose	Growth, repair, asexual reproduction	Formation of gametes (sexual reproduction)
Where it happens	Body (somatic) cells	Reproductive cells (testes/ovaries; anthers/ovules in plants)
Number of divisions	One	Two
Number of daughter cells	2	4
Chromosome number	Stays the same (2n → 2n)	Halved (2n → n)
Genetic make-up	Identical to the parent cell	Different from the parent and each other
Crossing over	Does not occur	Occurs in Prophase I
Pairing of homologous chromosomes	No	Yes, in Prophase I

Why Meiosis Matters

If gametes had the full 46 chromosomes, a fertilised egg would have 92, doubling every generation. Meiosis halves the number, so sperm (23) + egg (23) gives a zygote with the correct 46. Crossing over and the random arrangement of chromosomes also create variation — why siblings look different from each other.

How to Draw the Diagrams in Exams

1. Use a sharp pencil and draw large, clear circles for cells.
2. Show only 2 pairs of chromosomes (4 chromosomes) — enough to show the idea.
3. Use two shades (one dark, one light) for chromosomes from each parent. This makes crossing over easy to show.
4. Label clearly: chromosome, centromere, spindle fibres, nuclear membrane, equator/metaphase plate, poles.
5. Write the stage name under each diagram.
6. Mitosis metaphase: chromosomes in a single line. Meiosis I metaphase: chromosomes in pairs at the centre — the key difference examiners look for.

Memory Trick

Mitosis → "My-toes": your toes grow by mitosis, giving body cells that are identical. Meiosis → "Me-i-osis" makes "Me", a new individual, through gametes.

Frequently Asked Questions

What is the main difference between mitosis and meiosis?
Mitosis produces two identical cells with the same chromosome number. Meiosis produces four genetically different cells with half the chromosome number.

Why is meiosis called reduction division?
Because Meiosis I reduces the chromosome number by half, from diploid (2n) to haploid (n).

In which stage does crossing over occur?
In Prophase I of meiosis, when homologous chromosomes pair up.

Where does mitosis occur in the human body?
In body (somatic) cells, such as skin cells, the cells lining the gut and bone marrow cells.

How many chromosomes does a human gamete have?
23, half of the 46 found in body cells.