FAQ: What Is The Most Common Known Biological Cause Of Intellectual Disability?

The most common known preventable or environmental cause of intellectual disability is fetal alcohol syndrome, the most common chromosomal cause is Down syndrome, and the most common genetic cause is Fragile X syndrome.

What is the best known most prevalent biologically caused intellectual disability?

Down syndrome is the most common genetic cause of intellectual disability.

What is the number one cause of intellectual disability?

The leading causes are Autism, Down syndrome, Fragile X syndrome, and fetal alcohol syndrome or FAS. Among these, the only preventable cause is fetal alcohol syndrome. Medical conditions that lead to intellectual disabilities fall into three groups.

What are the most common intellectual disabilities?

5 Most Common Types of Intellectual Disabilities

  • Autism. Autism is an intellectual disability affecting the nervous system and the structure and function of the brain.
  • Down’s Syndrome.
  • Fragile X Syndrome.
  • Fetal Alcohol Syndrome.
  • Prader-Willi Syndrome (PWS)
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What are the biological causes of disability?

Common causes of developmental disabilities include genetic or chromosomal abnormalities, substance exposure, preterm birth, low birth weight and specific infectious diseases. Environmental toxicants have the ability to play a role in each of these causal mechanisms.

What is the most common inherited cause of mental retardation?

Fragile X syndrome is the most common inherited form of mental retardation and, after Down syndrome, the most common genetic form. It is X linked, with dominant inheritance, and the penetrance is lower in females.

What are four common causes of intellectual disability?

For many children, the cause of their intellectual disability is unknown. Some causes of intellectual disability—such as Down syndrome, Fetal Alcohol Syndrome, Fragile X syndrome, birth defects, and infections —can happen before birth. Some happen while a baby is being born or soon after birth.

What are the three leading causes of intellectual disabilities?

The three major known causes of intellectual disability are Down syndrome, Fetal Alcohol Spectrum Disorder (FASD) and Fragile X syndrome.

What four risk factors are associated with causes of intellectual disabilities?

Causes of intellectual disability can include:

  • Infections (present at birth or occurring after birth)
  • Chromosomal abnormalities (such as Down syndrome)
  • Environmental.
  • Metabolic (such as hyperbilirubinemia, or very high bilirubin levels in babies)
  • Nutritional (such as malnutrition)

Which of the following is a preventable condition that is known to cause intellectual disability?

The most common known preventable or environmental cause of intellectual disability is fetal alcohol syndrome, the most common chromosomal cause is Down syndrome, and the most common genetic cause is Fragile X syndrome.

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What are the 3 main diagnostic criteria for intellectual disability?

Diagnostic Criteria for Intellectual Disabilities: DSM-5 Criteria

  • Reasoning;
  • Problem solving;
  • Planning;
  • Abstract thinking;
  • Judgment;
  • Academic learning (ability to learn in school via traditional teaching methods);
  • Experiential learning (the ability to learn through experience, trial and error, and observation).

What are the 3 levels of intellectual disability?

There are four levels of ID:

  • mild.
  • moderate.
  • severe.
  • profound.

What is a biological disability?

Biological Disorders: disturbances of the normal state of the body or mind. Disorders of structure or function in an animal or plant. ( Oxford) Disorders may be caused by genetic factors, disease, or “trauma.” (

What are the biological and environmental factors that can cause intellectual and developmental disabilities?

The Many Causes of Intellectual Disabilities, Fetal Alcohol Syndrome and Environmental Exposure to Toxins

  • Medical Conditions;
  • Brain Damage;
  • Genetic Conditions;
  • Psychiatric Conditions.

What influences cause developmental disabilities?

These factors include genetics; parental health and behaviors (such as smoking and drinking) during pregnancy; complications during birth; infections the mother might have during pregnancy or the baby might have very early in life; and exposure of the mother or child to high levels of environmental toxins, such as lead

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