What are the leading environmental and biological causes of intellectual disability?

Down syndrome is the largest genetic cause of ID, and Fragile X syndrome is the largest inherited cause of ID. Fetal alcohol syndrome is the largest environmental cause of ID.

What are the environmental causes of intellectual disability?

Environmental exposure to toxins

Pre- and post-natal exposure to toxins can cause intellectual disabilities. Of particular concern are lead, mercury, and radiation. Avoiding exposure to these toxins reduces the risk of developing an intellectual disability. Mercury is found in polluted waters.

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

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 biological cause of an intellectual disability?

The two most common genetic causes of intellectual disabilities are Down syndrome and Fragile X syndrome. Down syndrome is the most common genetic origin of intellectual disabilities (ID, formerly mental retardation). Down syndrome occurs in 1 out of every 800 births.

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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.

How can the environment cause learning disabilities?

Environmental causes of learning disabilities includes trauma during the pre- natal, perinatal and postnatal phases and includes accidental and non- accidental injury. At the prenatal stage, this also includes the delivery of the child using forceps or suction.

Which of the following disorder is the most common cause of preventable mental retardation?

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.

Which of the following developmental disabilities is most likely to cause an intellectual disability?

Some of the most common known causes of intellectual disability include fetal alcohol syndrome disorder; genetic and chromosomal conditions, such as Down syndrome and fragile X syndrome; and certain infections during pregnancy.

What are the genetic causes of disability?

The two most common genetic causes of intellectual disabilities are Down syndrome and Fragile X syndrome. Down syndrome is the most common genetic origin of intellectual disabilities (ID, formerly mental retardation). Down syndrome occurs in 1 out of every 800 births.

What are the two most common causes of intellectual disability?

The most common causes of intellectual disabilities are:

  • Genetic conditions. Sometimes an intellectual disability is caused by abnormal genes inherited from parents, errors when genes combine, or other reasons. …
  • Complications during pregnancy. …
  • Problems during birth. …
  • Diseases or toxic exposure.
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What four risk factors are associated with causes of intellectual disabilities provide an example of each )?

Causes and risk factors for intellectual disabilities

  • Malnutrition.
  • Low parental IQ.
  • Prenatal alcohol or drug exposure.
  • Contraction of illnesses or infections while in utero.
  • Deprivation of oxygen during birth.
  • Brain injury.