Solved I need help filling this diagram with the chromosomes ... - Free Printable

Let's solve this step-by-step based on the Mitosis and Meiosis Worksheet you've provided.

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🔬 Task: Draw the chromosomes as it undergoes a haploid mitosis

We are given a starting cell with haploid chromosomes (n = 4), meaning it has 4 individual chromosomes, each consisting of two sister chromatids after DNA replication (since mitosis begins after S phase).

But wait — in haploid cells, there is no pairing of homologous chromosomes like in diploid cells. The key point here is that mitosis can occur in haploid cells, such as in fungi, some algae, or gametes in certain organisms.

In this case, we're showing haploid mitosis — so the cell starts with 4 chromosomes, each composed of two sister chromatids (because DNA has already been replicated). Then, the cell goes through the stages of mitosis: Prophase → Metaphase → Anaphase → Telophase → Daughter Cells.

Let’s go through each stage and describe what should be drawn.

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🧬 Step-by-Step Drawing Guide

#### ✔ Starting Cell (Interphase, before mitosis):
- 4 chromosomes (each is duplicated: two sister chromatids joined at the centromere)
- Represented by 4 red chromosomes, each with a blue dot (centromere), and each chromosome consists of two sister chromatids.
- So total: 4 chromosomes, 8 chromatids

> This is already shown in the first circle.

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1️⃣ Prophase

- Chromosomes condense and become visible.
- Nuclear envelope breaks down.
- Spindle fibers begin to form.

✔ Draw:
- 4 chromosomes (each still made of two sister chromatids).
- They are condensed and scattered in the cytoplasm.
- No nuclear membrane.
- Optional: draw spindle fibers beginning to attach to centromeres.

> Important: The chromosomes are not lined up yet.

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2️⃣ Metaphase

- Chromosomes line up at the equator (middle) of the cell.
- Spindle fibers from opposite poles attach to sister chromatids.

✔ Draw:
- 4 chromosomes (each with two chromatids) aligned in a single line at the center of the cell.
- Each chromosome attached to spindle fibers from both poles.

> Note: In haploid cells, there is no pairing — just alignment of individual chromosomes.

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3️⃣ Anaphase

- Sister chromatids separate and are pulled toward opposite poles.
- Now they are considered individual chromosomes.

✔ Draw:
- 8 individual chromosomes (each former chromatid is now a chromosome).
- Moving toward opposite ends of the cell.
- Spindle fibers shorten, pulling them apart.

> Total: 8 chromosomes being pulled apart → 4 per pole.

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4️⃣ Telophase

- Chromosomes arrive at opposite poles.
- Nuclear envelopes reform around each set.
- Spindle fibers disappear.

✔ Draw:
- Two nuclei forming at each end.
- Chromosomes decondense slightly.
- 4 chromosomes in each nucleus (each was one chromatid from the original).

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5️⃣ Daughter Cells

- After cytokinesis, two daughter cells form.
- Each has 4 chromosomes, same as the parent (haploid).
- Each chromosome is unduplicated (single chromatid).

✔ Draw:
- Two separate cells.
- Each has 4 chromosomes (not paired, single chromatid each).
- Nuclei present.

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✔ Summary of What to Draw:

| Stage | Number of Chromosomes | Chromatid State | Notes |
|--------------|------------------------|-----------------------------|-------|
| Start (G2) | 4 | Each has 2 sister chromatids | Duplicated |
| Prophase | 4 | Still 2 chromatids each | Condensed, spindle forms |
| Metaphase | 4 | 2 chromatids each | Aligned at equator |
| Anaphase | 8 (temporarily) | Separated into single chromatids | Moving apart |
| Telophase | 4 per pole | Single chromatid each | Nuclei reforming |
| Daughter Cells | 4 per cell | Single chromatid each | Haploid, genetically identical |

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📝 Final Answer: What to Draw in Each Circle

#### ➤ Prophase:
- 4 chromosomes (each with two chromatids), condensed, scattered in the cell.
- No nucleus.
- Spindle fibers may be drawn.

#### ➤ Metaphase:
- 4 chromosomes aligned at the center.
- Spindle fibers attached to centromeres.

#### ➤ Anaphase:
- 8 chromatids (now called chromosomes) moving to opposite poles.
- Two groups of 4 chromosomes moving apart.

#### ➤ Telophase:
- Two nuclei forming.
- 4 chromosomes at each pole.
- Chromosomes less condensed.

#### ➤ Daughter Cells:
- Two separate cells.
- Each has 4 chromosomes (single chromatid).
- Nuclei present.

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🌱 Functions of Mitosis

Now let’s answer the questions below the diagram.

#### Functions of mitosis in sexually reproducing organisms:
- Growth and development of multicellular organisms.
- Repair and replacement of damaged or dead cells.
- Asexual reproduction in some tissues (e.g., skin, blood cells).
- Maintains chromosomal number (diploid → diploid).

> ✔ Example: Skin cell regeneration, wound healing.

#### Functions of mitosis in asexually reproducing organisms:
- Produces genetically identical offspring (clones).
- Used for vegetative propagation (e.g., runners in strawberries, tubers in potatoes).
- Enables rapid population growth without mating.

> ✔ Example: Binary fission in bacteria (though technically prokaryotic), budding in yeast, fragmentation in starfish.

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✔ Final Notes:

- This is haploid mitosis, so the chromosome number remains n = 4 throughout.
- The daughter cells are identical to the parent cell and to each other.
- No crossing over or reduction division — this is not meiosis.

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