biology

Hairless dog

Hairless dog 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 Hairless dog rather than just read about it. In short: A hairless dog is a dog with a genetic disposition for hairlessness and hair loss. There are two known types of genetic hairlessness, a dominant and a recessive type.

Key takeaways

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

Reference excerpt

A hairless dog is a dog with a genetic disposition for hairlessness and hair loss. There are two known types of genetic hairlessness, a dominant and a recessive type. The dominant type is caused by ectodermal dysplasia as a result of a mutation in the FOXI3 autosomal gene.

Dominant genes Dogs with dominant genes for hairlessness can pass their attributes to their offspring in natural conditions; that is, not under the control of humans. Therefore, it is possible that, in some parts of the world, groups of hairless dogs came into existence without human intervention. Later in history, people developed these groups into recognized breeds. Worldwide recognized breeds at this time are the Chinese Crested Dog, the Xoloitzcuintle (Mexican Hairless Dog), the Peruvian Inca Orchid. The Argentine Pila, the Hairless Khala from Bolivia, and the Ecuadorian Hairless Dog are not registered hairless dog breeds. Other breeds that were said to have existed in the past were the African hairless dog (also known as the Abyssinian sand terrier, Egyptian hairless dog and African elephant dog, the last being a reference to its grey skin) and the Siamese Hairless Dog. This type of genetic structure is said to be homozygous pre-natal lethal for the dominant gene. This means that zygotes with two dominant genes cannot live. Therefore, all dominant-hairless dogs have a heterozygous gene structure. This allows a homozygous recessive type to persist, which is the coated variety. For dogs where hairlessness is a dominant gene, hairless to hairless matings will on average produce 66.6% hairless and 33.3% coated puppies. For hairless to coated matings, there will be an average of 50%/50% coated to hairless ratio, while for coated to coated matings, all puppies will be coated. The Chinese Crested Dog's coated variety is called a "Powderpuff" and is a recognized type. The coated variety of the Xoloitzcuintle is recognized as a valid type for conformation showing with some registries, including the AKC. Coated varieties of the other breeds may or may not be recognized as valid varieties for conformation showing, depending on the breed and show or registry organization.

Hairless dog breeds American Hairless Terrier Argentine Pila Chinese Crested Dog Hairless Khala Jonangi Peruvian Inca Orchid Xoloitzcuintle Ecuadorian Hairless Dog

Gallery

References

Citations

Bibliography Morris, Desmond (2001). Dogs: the ultimate dictionary of over 1,000 dog breeds. North Pomfret, VT: Trafalgar Square Publishing. ISBN 1-57076-219-8.

Illustrations

Hairless dog: An African hairless dog at the Walter Rothschild Zoological Museum, Tring, England — An African hairless dog at the Walter Rothschild Zoological Museum, Tring, England

Worked examples

Example 1 — a first encounter with Hairless dog

Start with the simplest possible case. Write down what Hairless dog 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 Hairless dog 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 Hairless dog 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 Hairless dog

In research: Hairless dog 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 Hairless dog 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: Hairless dog is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dog anatomy, Dog types, Hairless dogs, so understanding it makes those chapters shorter.
In everyday life: Look for Hairless dog 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.

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How to study Hairless dog in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hairless dog 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 Hairless dog out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hairless dog in simple terms?

A hairless dog is a dog with a genetic disposition for hairlessness and hair loss. There are two known types of genetic hairlessness, a dominant and a recessive type.

Why does Hairless dog 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 Hairless dog?

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 Hairless dog.