biology

Schultz's rule

Schultz's rule is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Schultz's rule rather than just read about it. In short: Schultz's rule is a rule developed by Adolph Hans Schultz, declaring a relationship between the first tooth eruption of the molar versus the permanent teeth and the progress or aging of its carrier. It states that species that live longer have more wear on deciduous teeth and as a result start replacing them relatively early in life.

Key takeaways

Schultz's rule belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Schultz's rule to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Schultz's rule from memory before moving on to harder problems.

Reference excerpt

Schultz's rule is a rule developed by Adolph Hans Schultz, declaring a relationship between the first tooth eruption of the molar versus the permanent teeth and the progress or aging of its carrier. It states that species that live longer have more wear on deciduous teeth and as a result start replacing them relatively early in life. Which is an indicator for examining fossil data. According to research, Myotragus balearicus follows Schultz's Rule.

See also Diphyodont - animals who grow one replacement for each tooth Polyphyodont - animals who continue to grow new teeth throughout their life Animal tooth development Human tooth development

References

Further reading Schultz, Adolph H. (1935). "Eruption and decay of the permanent teeth in primates". American Journal of Physical Anthropology. 19 (4): 489–581. doi:10.1002/ajpa.1330190417. Schultz, Adolph Hans (1960). Age changes in primates and their modification in man. Oxford: Pergamon Press. OCLC 81242023.

Worked examples

Example 1 — a first encounter with Schultz's rule

Start with the simplest possible case. Write down what Schultz's rule claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Schultz's rule before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Schultz's rule ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Schultz's rule

In research: Schultz's rule appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Schultz's rule in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Schultz's rule is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anatomy stubs, Animal anatomy, Dentistry stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Schultz's rule outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Schultz's rule” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Schultz's rule in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Schultz's rule means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Schultz's rule out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Schultz's rule in simple terms?

Why does Schultz's rule matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Schultz's rule?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Schultz's rule.