Meiosis worksheet online exercise for - Free Printable

Let's solve this Meiosis Worksheet step by step.

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🔬 Understanding Meiosis

Meiosis is a type of cell division that reduces the chromosome number by half, producing four genetically diverse haploid cells (gametes) from one diploid parent cell. It consists of two successive divisions:
- Meiosis I: Homologous chromosomes separate.
- Meiosis II: Sister chromatids separate (similar to mitosis).

Each division has four phases: Prophase, Metaphase, Anaphase, Telophase.

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We are given 8 diagrams, each with a description, and we need to match each diagram to the correct stage using the provided labels:

> Available Labels:
- Anaphase I
- Prophase I
- Telophase I
- Metaphase I
- Anaphase II
- Prophase II
- Metaphase II
- Telophase II

Let’s go through each image in order and match them based on the descriptions and visuals.

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🟨 Top Row (Meiosis I)

#### 1. First Diagram (Top Left)
- Description: "The chromosomes condense, and the nuclear envelope breaks down. Crossing-over occurs."
- Key Features: Chromosomes are paired (homologous), crossing over visible, nuclear envelope breaking down.
- ✔ This is Prophase I

> 🔹 Answer: Prophase I

#### 2. Second Diagram
- Description: "Pairs of homologous chromosomes move to the equator of the cell."
- Visual: Homologous pairs lined up at the center (metaphase plate).
- ✔ This is Metaphase I

> 🔹 Answer: Metaphase I

#### 3. Third Diagram
- Description: "Homologous chromosomes move to the opposite poles of the cell."
- Visual: Homologous chromosomes being pulled apart (each pole gets one from each pair).
- ✔ This is Anaphase I

> 🔹 Answer: Anaphase I

#### 4. Fourth Diagram
- Description: "Chromosomes gather at the poles of the cells. The cytoplasm divides."
- Visual: Two nuclei forming, chromosomes at poles, cleavage furrow present.
- ✔ This is Telophase I

> 🔹 Answer: Telophase I

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🟩 Middle Row (Meiosis II)

#### 5. Fifth Diagram (Bottom Left of Top Middle Row)
- Description: "A new spindle forms around the chromosomes."
- Visual: Chromosomes not yet aligned, spindle fibers forming — no pairing.
- ✔ This is Prophase II

> 🔹 Answer: Prophase II

#### 6. Sixth Diagram
- Description: "Metaphase II chromosomes line up at the equator."
- Visual: Individual chromosomes (each with two sister chromatids) lined up at equator.
- ✔ This is Metaphase II

> 🔹 Answer: Metaphase II

#### 7. Seventh Diagram
- Description: "Centromeres divide. Chromatids move to the opposite poles of the cells."
- Visual: Sister chromatids separating and moving to poles.
- ✔ This is Anaphase II

> 🔹 Answer: Anaphase II

#### 8. Eighth Diagram
- Description: "A nuclear envelope forms around each set of chromosomes. The cytoplasm divides."
- Visual: Four daughter cells forming, nuclear envelopes reforming.
- ✔ This is Telophase II

> 🔹 Answer: Telophase II

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✔ Final Answer Key (From Left to Right, Top to Bottom)

| Diagram | Stage |
|--------|------------------|
| 1 | Prophase I |
| 2 | Metaphase I |
| 3 | Anaphase I |
| 4 | Telophase I |
| 5 | Prophase II |
| 6 | Metaphase II |
| 7 | Anaphase II |
| 8 | Telophase II |

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📌 Summary of Stages in Order:

1. Prophase I – Chromosomes condense, synapse, cross over.
2. Metaphase I – Homologous pairs align at equator.
3. Anaphase I – Homologous chromosomes separate.
4. Telophase I & Cytokinesis – Two haploid cells form.
5. Prophase II – Chromosomes condense again.
6. Metaphase II – Chromosomes align at equator.
7. Anaphase II – Sister chromatids separate.
8. Telophase II & Cytokinesis – Four haploid gametes formed.

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✔ All stages correctly matched!

Let me know if you'd like a printable version or explanation for any specific phase!