IB Biology Topic D2.1.8 Identification of Phases of Mitosis Revision Notes (SL/HL)

IB Biology Topic D2.1.8 Identification of Phases of Mitosis Revision Notes (SL/HL) | RevisionDojo

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Each Mitotic Phase Has a Signature Look You Can Spot in a Micrograph

Mitosis has four phases: prophase, metaphase, anaphase, and telophase.
You can tell them apart by what the chromosomes look like and where they sit in the cell.

Analogy

Think of a photo finish at a race.
A micrograph freezes one moment, so you read the runners' positions to know what is happening.
Here the chromosomes are the runners, and their positions tell you the phase.

Prophase: Threads Appear and the Nucleus Vanishes

The identifying clue is thick, thread-like chromosomes that have become visible inside the cell.
There is no clear nuclear envelope, because it has broken down.
The chromosomes are still scattered, not lined up in any pattern.

Tip

To spot prophase, look for dark, tangled threads with no nuclear boundary around them.

Metaphase: Chromosomes Line Up Across the Middle

The identifying clue is a single neat row of chromosomes across the cell's middle.
This row sits at the equator of the cell and is called the metaphase plate.

Tip

If the chromosomes form one tidy line down the centre, it is metaphase.

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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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Each Mitotic Phase Has a Signature Look You Can Spot in a Micrograph

Mitosis has four phases: prophase, metaphase, anaphase, and telophase.
You can tell them apart by what the chromosomes look like and where they sit in the cell.

Analogy

Think of a photo finish at a race.
A micrograph freezes one moment, so you read the runners' positions to know what is happening.
Here the chromosomes are the runners, and their positions tell you the phase.

Prophase: Threads Appear and the Nucleus Vanishes

The identifying clue is thick, thread-like chromosomes that have become visible inside the cell.
There is no clear nuclear envelope, because it has broken down.
The chromosomes are still scattered, not lined up in any pattern.

Tip

To spot prophase, look for dark, tangled threads with no nuclear boundary around them.

Metaphase: Chromosomes Line Up Across the Middle

The identifying clue is a single neat row of chromosomes across the cell's middle.
This row sits at the equator of the cell and is called the metaphase plate.

Tip

If the chromosomes form one tidy line down the centre, it is metaphase.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D2.1.8: Identification of Phases of Mitosis Notes

Each Mitotic Phase Has a Signature Look You Can Spot in a Micrograph

Prophase: Threads Appear and the Nucleus Vanishes

Metaphase: Chromosomes Line Up Across the Middle

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Each Mitotic Phase Has a Signature Look You Can Spot in a Micrograph

Prophase: Threads Appear and the Nucleus Vanishes

Metaphase: Chromosomes Line Up Across the Middle

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics