Clarissa's mother was 38 years old when she gave birth to her. Clarissa suffers from an intellectual disability, and doctors have diagnosed that her condition is due to the extra chromosome that she received at the time of conception. Identify the condition afflicting Clarissa.

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Quizplus · Accepted Answer

Down syndrome is a genetic condition caused by the presence of an extra copy of chromosome 21. It is also known as trisomy 21. Symptoms include intellectual disability, developmental delays, characteristic facial features, and other health problems such as heart defects and hearing loss. People with Down syndrome have 47 chromosomes instead of the usual 46. Phenylketonuria, sickle-cell anemia, and Tay-Sachs disease are all genetic disorders caused by specific gene mutations, not by an extra chromosome.

Clarissa's Mother Was 38 Years Old When She Gave Birth