biology

McDonough syndrome

McDonough syndrome 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 McDonough syndrome rather than just read about it. In short: McDonough syndrome, also known as Intellectual disability, peculiar facies, kyphoscoliosis, diastasis recti, cryptorchidism, and congenital heart defect is a very rare multi-systemic genetic disorder which is characterized by facial dysmorphisms, psychomotor delays, intellectual disabilities, and congenital heart defects. Additional findings include either pectus excavatum or pectus carinatum, kyphoscoliosis, diasta…

Key takeaways

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

Reference excerpt

McDonough syndrome, also known as Intellectual disability, peculiar facies, kyphoscoliosis, diastasis recti, cryptorchidism, and congenital heart defect is a very rare multi-systemic genetic disorder which is characterized by facial dysmorphisms, psychomotor delays, intellectual disabilities, and congenital heart defects. Additional findings include either pectus excavatum or pectus carinatum, kyphoscoliosis, diastasis recti and cryptorchidism.

Signs and symptoms The following is a list of the symptoms individuals with this disorder usually exhibit:

Superciliary arc prominence Unibrow (clinically known as synophrys) Strabismus Large ears with anteversion Large nose Teeth malocclusion Psychomotor delay Intellectual disabilities Pulmonic stenosis Patent ductus arteriosus Atrial septal defect Less common symptoms include chest defects, kyphoscoliosis, diastasis recti ane cryptorchidism

Cases 6 cases have been reported in medical literature:

Gerhard Neuhäuser and John M. Opitz describes 3 out of 5 siblings from a 2-generation non-consanguineous family from Wisconsin with the symptoms mentioned above. These kids had IQs ranging from 47 to 67, which is considered clinical mental retardation. The youngest affected sibling had two X chromosomes and one Y chromosome and his father had te mosaic version of said disorder (46,XY/47,XXY). 1975 Garcia-Sagredo et al. describes 2 out of 3 siblings from a Spanish family. They had both the symptoms and the additional findings listed above in the article. One (male) of the children and his unaffected mother carried a balanced translocation on the 20th chromosome and the X chromosome. 1984 Parul Jain, Ritu Arora, Abhilasha Sanoria, Akshay K Singh described 1 out of 3 siblings from a 2-generation family from New Delhi, India: an 11 year old boy with the symptoms mentioned above and blepharoptosis with low visual acuity. 2022

References

Illustrations

Worked examples

Example 1 — a first encounter with McDonough syndrome

Start with the simplest possible case. Write down what McDonough syndrome 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 McDonough syndrome 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 McDonough syndrome 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 McDonough syndrome

In research: McDonough syndrome 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 McDonough syndrome 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: McDonough syndrome is common in secondary-school and first-year university syllabi. It links to neighbouring topics Rare genetic syndromes, Syndromes affecting the heart, Syndromes with craniofacial abnormalities, so understanding it makes those chapters shorter.
In everyday life: Look for McDonough syndrome 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 McDonough syndrome in 20 minutes

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

Frequently asked questions

What is McDonough syndrome in simple terms?

Why does McDonough syndrome 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 McDonough syndrome?

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 McDonough syndrome.