Which of the Following Is Associated with Mental Retardation in Down

question 29

Multiple Choice

Which of the following is associated with mental retardation in Down syndrome?

• A) elevated levels of purines in the blood
• B) increased tendency toward leukemia
• C) increased tendency toward cataracts
• D) accelerated rate of aging

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Definitions:

X-Linked Recessive

A pattern of genetic inheritance where the gene causing the trait or disorder is located on the X chromosome; more common in males who have only one X chromosome.

Vasoocclusive Crisis

A painful episode that occurs in sickle cell anemia when sickled red blood cells block blood flow through vessels.

Sickle Cell Crisis

A severe, painful episode that occurs in people who have sickle cell anemia, caused by blockage of blood flow by misshaped red blood cells.

Sickle Cell Trait

The condition of having one gene for sickle cell anemia and one normal gene, which can result in milder symptoms compared to sickle cell disease.