Choose a station on the bar along the bottom. The stations follow your T17 revision summary, in its order. Each station has its own picture on the left: chromosomes, a dividing cell, a family, a cross. Press a part of the picture and its card opens on the right; open a card and its part shows in the picture.
Each station has two tabs: Learn, what you must know, with something to press or to step through, and Practise, the questions.
An animation plays one step, then waits: press Next step when you have read it. Play all runs straight through, for revision.
Check as often as you like. You are told which parts are wrong, never the answer: you must find it yourself. Try again until every part is right.
An underlined word can be pressed: ↗ takes you to the station that explains it, with a button to return here, ↓ takes you to its card in Key words, at the bottom of the station, and a faint dotted line opens the definition.
The Glossary (용어집 · 词汇表) lists every word with its definition. Choose 한국어, 中文 or 日本語 at its top to see the name of each word in that language. The definitions stay in English, the language of the exam.
Your work is kept in this browser and, once you sign in with your school account, sent to Dr Mompel’s records automatically while you work. You do not need to submit anything. Signed in, you can continue your work on another computer.
☾ Dark and ☀ Bright switch the page between its two versions.
The answers are never shown. Sign in with your school Google account so Dr Mompel knows whose work it is. Anyone else is welcome to use the lab: their work stays in their own browser.
What the colours mean
In the text, the colours of your T17 summary: green words are structures (chromosomes, genes, the nucleus, ribosomes); orange words are processes (mitosis, meiosis, fertilisation); rose words are substances (DNA, mRNA, proteins, amino acids).
A box with a red border is the mistake students most often make there. A small S badge means Supplement (Extended papers 2 and 4 only): in this topic, 17.1.5–17.1.12, mitosis, meiosis, the test cross, codominance and sex linkage. What you need to know holds only what the syllabus for exams in 2026–2029 asks: Cambridge’s syllabus for 2029 is word for word the same as the one for 2026–2028. Everything else is in the card directly below it, “Not in the syllabus for 2026–2029”. Do not skip it: an exam question can still use these ideas.
The sources of the content and the pictures
The definitions are the wording of the syllabus for 2026–2029; everything else says what your T17 revision summary says, in its words, checked against the Cambridge mark schemes.
Every photograph is a real one, credited under it. The chromosomes, alleles, genetic diagrams and family trees are drawn for this lab, with every symbol in a key. They are listed in full below and in assets/photos/CREDITS.md.