A-Level Biology Technician Guide: Identifying Stages of Mitosis Under a Microscope

The reality of this practical is straightforward:

• Prophase
• Metaphase
• Anaphase
• Telophase

In reality:

• Mostly interphase
• A few unclear stages
• And a lot of “is this right?”

That’s completely normal. Cells spend most of their time in interphase, so mitosis can be harder to spot than students expect.

Always good to have a backup (non-negotiable)

This is one of those practicals where things can and do go wrong.

So the golden rule:

Always have a backup ready to go.

Pre-prepared slides give you:

• Guaranteed visible stages
• A clear reference point
• A safety net if the squash doesn’t work

Recommended option

Allium Root Tip – Stained for Mitosis (BB1238)

• Clear, high-contrast chromosomes
• Multiple stages in one field
• Reliable for both teaching and demonstration

Best way to use it:

• Demonstrate first (what “good” looks like)
• Then let students attempt their own

Then move onto the root tip squash

This is where students experience real biology.

Why it matters

• Shows how samples are actually prepared
• Reinforces that results aren’t always perfect
• Builds practical skills, not just theory

Quick method recap

• Grow onion roots in advance
• Cut ~1 cm root tip
• HCl treatment
• Stain
• Mount and squash vertically

Pitfalls (and how you support the teacher)

This is where technicians make the difference.

Common issues:

• Slides too thick → nothing visible
• Poor staining → no contrast
• Wrong area → no dividing cells
• Students unsure what they’re looking for

Your role:

• Pre-check slides before the lesson
• Prepare a strong demo slide
• Have spares ready
• Brief the teacher/student teacher on what to expect

Tips & tricks that actually help

• Start on low power, then move up
• Look for condensed chromosomes, not just nuclei
• If you see a clear nucleus → likely interphase
• Keep a “known good” slide aside

And again:

Prepared slides + student practical = best outcome

The teaching moment (worth reinforcing)

This practical is a perfect comparison:

Prepared slides provide clear, textbook examples that are easy to interpret. Student-prepared slides, by contrast, are often messier and reflect the realities of practical laboratory work. While prepared slides show the ideal appearance of each stage of mitosis, student slides require careful observation and judgement to interpret correctly.

That contrast is powerful.

It shows students that:

• Science isn’t always neat
• Results vary
• Interpretation matters

The microscope matters more than people think

You can prep the perfect slide—but if the microscope is poor, students still won’t see anything.

Older microscopes often have:

• Lower resolution
• Poor optics
• Reduced clarity

Which makes spotting mitosis stages much harder.

Good microscope options (that actually make a difference)

Here are three solid options across budgets that will genuinely improve outcomes:

Budget option – reliable and accessible

Budget Buster Microscope (MIC5740)

• Ideal entry-level scope
• Good clarity for basic identification
• Perfect where budget is tight

Mid-range – added control for students

Microscope with Mechanical Stage (MIC6618)

• Mechanical stage allows smooth slide movement
• Students can track across the slide easily
• Much better for scanning and locating mitotic cells

👉 This is a big step up in terms of usability.

Higher level – best for teaching environments

Binocular Microscope (MIC8014)

• Improved depth perception
• Reduced eye strain
• Better overall viewing experience

👉 Especially useful for:

• Longer practical sessions
• Maintaining student engagement
• Supporting accurate identification

Take it a step further – Using microscope cameras (a genuine game changer)

Microscope Camera (MIC4320)

This is one of the most effective ways to improve this practical.

Why it works:

• You can project real-time images onto the board
• Show students exactly what each stage looks like
• Remove the guesswork

Even better:

Students can:

• Bring their own slide up
• Share what they’ve found
• Compare with others

This turns the lesson from:

“I can’t see anything”

Into:

“Right, I can see what I’m looking for now”

Best way to use it:

1. Start with BB1238 prepared slide on screen
2. Walk through mitosis stages as a class
3. Let students attempt their own slides
4. Bring up good examples from the class

👉 It builds confidence quickly and keeps students engaged.

Final word – how technicians make this practical work

This is one of those lessons where your prep makes or breaks it.

To get the best outcome for students:

• Always have a backup (BB1238 prepared slide)
• Support with a well-prepared root tip squash
• Ensure microscopes are fit for purpose
• Use projection where possible

Done right, students don’t just “see mitosis”—
they understand what real biological observation actually looks like.