Question

Which of the following disorder is caused by autosomal aneuploidy?

• A. Down's syndrome
• B. Haemophilia
• C. Sickle cell anaemia
• D. Phenylketonuria
• E. Klinefelter's syndrome

Answer 1

The correct option is A Down's syndrome

• Phenylketonuria and Sickle cell anemia is an autosomal recessive disorder.
• Hemophilia is a sex-linked recessive disorder.
• Klinefelter syndrome is a genetic condition in which a male is born with an extra copy of the X chromosome. it also called XXY syndrome.so its an x chromosome aneuploidy.
• Down syndrome, also known as trisomy 21. Down's syndrome is caused when abnormal cell division results in extra genetic material from chromosome 21.
  So, option A is correct answer.