Difficulty: Easy

Average Score: 100%

What is Down syndrome?

Rationale

A disorder that results from carrying extra genetic material from chromosome 21.

Down syndrome, also known as Trisomy 21, is characterized by the presence of an extra copy of chromosome 21, leading to a range of physical and intellectual disabilities. This genetic condition arises during cell division, resulting in three copies of this chromosome instead of the usual two.

A (A disorder in which red blood cells are irregularly shaped, die early, and leave a shortage of healthy red blood cells) YOUR ANSWER

This description aligns more closely with sickle cell disease, which is related to abnormal hemoglobin in red blood cells, leading to their sickle shape and premature death. This condition is not associated with Down syndrome, which is a chromosomal anomaly rather than a blood disorder.

B (A disorder that occurs due to prenatal exposure to alcohol) YOUR ANSWER

This option describes fetal alcohol spectrum disorders (FASD), which result from alcohol exposure during pregnancy. While FASD can cause developmental issues, it is not related to the chromosomal abnormalities seen in Down syndrome, which is specifically linked to chromosome 21.

C (A disorder caused by folate or Vitamin B9 deficiency during fetal development) YOUR ANSWER

This choice refers to neural tube defects, which can occur when there is inadequate folate during pregnancy. While nutritional deficiencies can lead to various developmental disorders, they do not cause Down syndrome, which is caused by an extra chromosome 21.

Conclusion

Down syndrome is specifically identified by the presence of an additional chromosome 21, leading to characteristic features and challenges. The other options describe different medical conditions that are not related to the genetic basis of Down syndrome. Understanding the unique genetic aspects of Down syndrome is crucial for diagnosis and support for individuals affected by this condition.

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