Question 1:

Which of the following is a chromosomal disorder caused by the presence of an extra copy of chromosome 21?

Explanation: B) Down syndrome, also known as trisomy 21, is caused by the presence of an extra copy of chromosome 21. It leads to various physical and intellectual disabilities.

Question 2:

Which of the following is a chromosomal disorder characterized by the absence of one X chromosome in females?

Explanation: A) Turner syndrome is a chromosomal disorder characterized by the absence of one X chromosome in females. It leads to various developmental and reproductive abnormalities.

Question 3:

Which of the following chromosomal disorders is characterized by the presence of an extra copy of the X chromosome in males?

Explanation: C) Klinefelter syndrome is a chromosomal disorder characterized by the presence of an extra copy of the X chromosome in males (XXY). It leads to various physical and reproductive abnormalities.

Question 4:

Which of the following chromosomal disorders is caused by a deletion of a portion of the short arm of chromosome 5?

Explanation: D) Cri-du-chat syndrome is a chromosomal disorder caused by a deletion of a portion of the short arm of chromosome 5. It leads to intellectual disability, distinctive facial features, and a high-pitched cat-like cry in affected individuals.

Question 5:

Which of the following chromosomal disorders is characterized by an extra copy of the Y chromosome in males?

Explanation: C) Klinefelter syndrome is characterized by the presence of an extra copy of the Y chromosome in males (XYY). It can lead to tall stature, learning difficulties, and behavioral problems.